Area = … Area of circle= 3.14r 2 3.14 (3 2) = 3.14 (3 x 3)= 3.14 x 9= 28.26 square inches We now to need find the length (L) for the square cake tin i.e. circumference L Customer Voice. Gravel Calculator Triangle Calculator Area of a circle Calculator. A sector of a circle has an area of 9 square inches. Area = 63.61 Inches Squared A 9-inch pizza is an example of a diameter: when one makes the first cut to slice a round pizza pie in half, this cut is the diameter of the pizza. Symbols. Finally, add the two areas together. 2. 3.142 . Non-numeric characters will not compute. The diameter is always twice the radius, so either form of the equation works. Circumference of a circle: C = πd = 2πr The d represents the measure of the diameter, and r represents the measure of the radius. The perimeter is measured in units such as centimeters,meters, kilometers, inches, feet, yards, and miles. The formula to find the area of the segment is given below. 2 Answers Parabola Mar 15, 2018 Read below. The area of a full circle is 50.24 square inches. If each square in the circle to the left has an area of 1 cm 2, you could count the total number of squares to get the area of this circle. Solution for If the radius of a circle is 9 in., find the radius of a circle whose area is 6 times as large. Divide 9 in to 2 so that you can get the radius = 9/2 = 4.5 in. (4.5)^2 A = 63.62 Sq.Inches . Compute the area using these units: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, … Now the 9 inch circle has a radius of 9/2 or 4.5. There are: pi*4 squared = 16*pi square inches or about 50 square inches Tags: Question 6 . 2. Find the area with this circle area formula: Multiply Pi (3.1416) with the square of the radius (r) 2. Definition: The number of square units it takes to fill a segment of a circle Try this Drag one of the orange dots that define the endpoints of the segment. The area of an 11-inch diameter circle is: 95.03 square inches. A decimal can be used if the measurement is not a whole number. How do you find the area of a 9 inch diameter circle? BookMark Us. Area (A): If you know the area of the circle and would like to calculate the circumference, diameter, and radius, enter the area on this line. SURVEY . What is the area? This will give you the cost per square inch of the pizza. It can also be found by calculating the area of the whole pie-shaped … Its perimeter is therefore 33.0 inches. A 45 ° central angle is one-eighth of a circle. Which process should he use? Free calculator widget. Finally, you would divide 1,764 by 12.57 … If your impeached can you run for president again? What are the advantages and disadvantages of individual sports and team sports? A "Real World" Example. Where: π is approximately equal to 3.14. If you know the circumference, radius, or diameter of a circle, you can also find its area. So for the 12 inch circle, the radius is 6. While every effort is made to ensure the accuracy of the information provided on this website, neither this website nor its authors are responsible for any errors or omissions, or for the results obtained from the use of this information. Those are easy fractions, but what if your central angle of a 9-inch pumpkin pie is, say, 31 °? Area = 3.1416 x r 2. A circle is 0.7854 times as heavy as a square of the same size. Is Betty White close to her stepchildren? What is the point of view of the story servant girl by estrella d alfon? Diameter of Circle. For a complete lesson on area of a circle, go to https://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! 2 Answers nightowl Feb 22, 2018 #10pi# Explanation: The equation for circumference is #2pir# You are given the diameter, which is double that of the radius. The Area and perimeter of a circle work with steps shows the complete step-by-step calculation for finding the circumference and area … Just enter the value of the radius and hit calculate button. Diameter = 9 in. When did organ music become associated with baseball? Tags: Question 5 ... A circular table top has an area of 324 square inches. What is the area? A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. Area = PI x R^2 =3.1416 x 4.5^2. answer choices . Now 4.5 squared is 20.25. You can put this calculator widget on your website, web page or blog. C. 28.26 inches squared. The area of a circle is pi (3.1415 is good for most calculations) multiplied by the square of the radius. Estimate of Circle's Area = 80% of Square's Area = 80% of 9 = 7.2 m 2. Pie or 3.14 times the radius squared. The square of the radius is 36, and multiplying this by pi gives approximately 113.1 square inches. He should multiply the radius times 2 and then multiply the result by 3.14. Area of Circle. Example: Max is building a house. answer choices . answer choices . Considering the pizza is a circle figure we can say that the area can be found by using the formula: To find the area using the circumference, or the distance around the circle, use the formula area = c^2/4π, where c is the circumference. How do you find the area of a 9 inch diameter circle. 18.0. B. A circle of radius = 4.5 or diameter = 9 or circumference = 28.27 feet has an area of: 5.91049 × 10 0 square kilometers (km²) 5.91049 square meters (m²) 5.91049 × 10 4 square centimeters (cm²) 20.28 inches squared. The first step is to drill holes and fill them with concrete. Therefore, the area of the circle is 314.16 inches squared. Circumference of the circle is equal to the twice of pi time radius of circle. As a result of Platypus' inconsideration, each person gets one-third less pie, and the daughter contemplatively recalls American history class, where she learned about the Battle of the … The area of an oval is the longest diameter x the shortest x 0.7854. To begin with, remember that pi is an irrational number written with the symbol π. π is roughly equal to 3.14. A circle of radius = 4.6 or diameter = 9.2 or circumference = 28.9 cm has an area of: 6.648 × 10-9 square kilometers (km²) 0.006648 square meters (m²) 66.48 square centimeters (cm²) 6648 square millimeters (mm²) 2.56681 × 10-9 square miles (mi²) 0.00795094 square yards (yd²) 0.0715585 square feet (ft²) 10.3044 square inches (in²) Square's Area = w 2 = 3 2 = 9 m 2. Click the Clear button to clear both fields. Area of a Circle area = Pi * radius 2 Enter either the radius or the diameter. 92=254.469in² A= 254.47 in² d. Find the volume of a rectangular box that measures 6 inches by 4 inches by 2 inches. The perimeter of the circle is called circumference of the circle. Enter the diameter of a circle. The circle has a diameter of 16 inches. What is the area of a circle with a DIAMETER of 9 inches (radius of 4.5 inches)? SURVEY . A sector of a circle has an area of 9 square inches. ENTER ANY ONE VALUE: Radius : clear: Diameter : clear: Area : clear: Circumference : clear: Calculate Clear : Use the calculator above to calculate the properties of a circle. Example: The area of a circle with a radius(r) of 3 inches is: Circle Area … For example, if a pizza costs $32 and has an area of 256 square inches, you would calculate ÷ =. [insert drawing of pumpkin pie with sector cut at +/- 31°] This formula helps you find the area, A, of the sector if you know the central angle in degrees, n °, and the radius, r, of the circle: All Rights Reserved. The area of a circle is pi (3.1415 is good for most calculations) multiplied by the square of the radius. A circle of radius = 6 or diameter = 12 or circumference = 37.7 inches has an area of: 7.29676 × 10-8 square kilometers (km²); 0.0729676 square meters (m²) 729.676 square centimeters (cm²) A circle is formed by combining a set of all points in a plane that are at a given distance from the centre point. A circle with a diameter of 14 feet 9 inches has an area of: 170.87 square feet. answer choices . A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. The area of a circle is the diameter x diameter x 0.7854. Use this easy and mobile-friendly calculator to compute the area of a circle given its diameter. What is the approximate area of the circle? Remember, the input can only be in feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m) but never a combination of two different units! If a circle has a diameter of 10 inches, what is the circumference? Area of a sector formula. The radius of a circle is 3 inches. If you input the radius in centimeters, you will get the answer in square centimeters (cm²), if in inches, will get the answer in square inches (in²) and so on ... Circumference is often misspelled as circunference. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. What is the first and second vision of mirza? You can enter the radius and then compute diameter and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.. Area has different units, but you can use: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and … Using the Radius Calculator. radius r diameter R; area S . What is the approximate length of the radius of the flower pot? What are the qualifications of a parliamentary candidate? 5.6 inches. Explanation: Happy #pi# day! Circle calculator, formula, work with steps, step by step calculation, real world and practice problems to learn how to find the area, circumference & diameter of a circle in inches… Return to the Shape Area section . 30 seconds . If JavaScript is not working on your browser, or in case you are simply curious, here is the procedure for calculating the diameter of a circle from its area. Use the following formula: Area = radius squared times pi. Remember, the input can only be in feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m) but never a combination of two different units! Finding the Area of a Circle . MUST DO: The diameter of a circle is 8 cm. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Using the Diameter Calculator. Calculates the area and circumference of a circle given the radius or diameter. The area of a circle with an 8 inch diameter is: 50.27 square inches. 201. The area of the semi-circle is 25.12 square inches. What are the difference between Japanese music and Philippine music? 56.5. What does it mean when there is no flag flying at the White House? Questionnaire. Tags: Question 5 . Diameter of Circle. We have a pizza which is perfectly round - like a circle figure.There are 8 total slices in the pizza.The pizza has a radius of 9 inches and diametre of 18 inches.We have to find the area of the pizza and the area of 1 slice of the pizza. Then, find the area of one half the circle, a semi-circle, by dividing your final answer by 2. A perimeter of 33-inches encloses that area. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle as long as they are exactly 180 degrees apart. The formula for working out the circumference of a circle is: Circumference of circle = π x Diameter of circle. The circumference of a circle can be defined as the distance around the circle, or the length of a circuit along the circle. This calculates the area as square units of the length used in the radius. What is the timbre of the song dandansoy? B. If you know the diameter or radius of a circle, you can work out the circumference. MUST DO: A flower pot has a circumference of 35 inches. Science Anatomy & Physiology Astronomy Astrophysics Biology Chemistry Earth Science Environmental Science Organic Chemistry Physics Math Algebra Calculus … So for the 12 inch circle, the radius is 6. which = 63.585 or orund the answer up to 63.86. Enter only digits 0-9 and a decimal point (if applicable). Half of 9 is 4.5, that is A. 50 cm squared. The following area of a circle calculator will help you find the area of any circle when the radius is given. Examples: If the depth is ten inches, enter “10”. Now the 9 inch circle has a radius of 9/2 or 4.5. 201 cm squared. The circle's area (A) will be calculated as you type. Visit https://www.MathHelp.com.This lesson covers the area of a circle. Let's look at some examples of finding the circumference of a circle. 50 cm squared. Given that each person will receive 60° worth of the pie with a radius of 16 inches, the area of pie that each person receives can be calculated as follows: area= 60°/360° × π × 16 2 = 134.041 in 2. 6.8 inches. 9.25 inches squared. Pi is an irrational number. It's given in units of distance squared, such as cm 2 or m 2. . Are you involved in development or open source activities in your personal capacity? 10.2. Area of Circle. To run the calculator, hit the 'Calculate Circle Dimensions' button when … Area of a circle: A = πr 2 This formula reads, “Area equals pi are squared.” L*W*H 6*4*2 24*2 = 48 V = 48 Cu In e. Use this easy and mobile-friendly calculator to compute the area of a circle given its diameter. Who is the longest reigning WWE Champion of all time? Circle's True Area = π /4) × D 2 = (π /4) × 3 2 = 7.07 m 2 (to 2 decimals) The estimate of 7.2 m 2 is not far off 7.07 m 2. Geometry Perimeter, Area, and Volume Circumference and Area of Circles. Volume to (Weight) Mass Converter for Recipes, Weight (Mass) to Volume to Converter for Recipes, Area of a Circle with diameter 1273 meters, Area of a Circle with circumference 50.24 inches, Area of a Circle with circumference 39.25 miles, Area of a Circle with circumference 56.52 units, Area of a Circle with radius 67 centimeters. Which measurement is closest to the radius of the table top in inches? How long will the footprints on the moon last? 3.3 inches. What is the area of a circle with a DIAMETER of 9 feet (radius of 4.5 feet)? The area of a circle that has a 12-inch diameter is: 113.1 square inches. Circle area = Pai x Diam2 / 4 = 3.14 x 8 x 8 /4 sq inch = 50.24 sq inchAnother Answer:-Area of the circle: pi*42 = 50.265 inches to three decimal places Diameter = 9 inches Radius = r = diameter /2 = 4.5 inches For Circumference: C = 2.pi.r C = 2 . Radius: Diameter: Circumference: Area: For help with using this calculator, see the shape area help page. It may come in handy. (inches) Circumference = 2*pi*R Radius = Diameter/2 Radius = 9 inches/ 2 radius = 4.5 inches Circumference = 2*pi * 4.5 inches Circumference = 2*3.14 * 4.5 inches Circumference = 28.26 inches Use this easy and mobile-friendly calculator to compute the area of a circle given its diameter. What is the WPS button on a wireless router? FAQ. The answer is the composite figure has an area of 73.12 square inches… r. π represents the number Pi which is defined as the ratio of the circumference of a circle to its diameter or π = Cd Algebra . Geoffrey needs to find the circumference of a circle. Since the formula for the area of a circle squares the radius, the area of the larger circle is always 4 (or 2 2) times the smaller circle.Think about it: You are doubling a number (which means ×2) and then squaring this (ie squaring 2) -- which leads to a new area … In the second field, labeled “Depth (Inches)” enter the depth, in inches, of the cylinder. An online geometry calculator to calculate the diameter of a circle based on the circumference. Need a custom math course? All information in this site is provided “as is”, with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information. There is another circular sector — part of a circle of a different size — that has the same 33-inch perimeter and that encloses the same area. 2 (8 x 4-inch) loaf pans1 (9-inch) tube pan; 2 (9-inch) round cake pans; 1 (10-inch) Bundt pan; 2 (11 x 7-inch) baking dishes; 2 (8-inch) round cake pans 8-inch square baking dish 8 cups Enter the area contained within a circle. Similarly, the formula for the area of a circle is tied to π and the radius:. 4.5 C = 28.278 inches For Area: A = pi.r^2 A = 3.142 . We have: 9=pir^2 Divide both sides by pi. It doesn't matter whether you want to find the area of a circle using diameter or radius - you'll need to use this constant in almost every case. A. Area of a Circle Segment Given the Central Angle. The radius can be any measurement of length. Area represents the space enclosed within a circle. Enter any single value and the other … Thus, if there were a total of 28.26 squares, the area of this circle would be 28.26 cm 2 However, it is easier to use one of the following formulas: or where is the area… Area of a circle diameter. 25 cm squared. If the diameter is seven feet, four inches, enter “7.33”. For an example, we have an area of 303,000 square meters. What is the area of a circle with a DIAMETER of 4 inches (radius of 2 inches)? For simplicity, you can use Pi = 3.14 or Pi = 3.1415. If the diameter is six feet, nine inches, enter “6.75”. Since the formula for the area of a circle squares the radius, the area of the larger circle is always 4 (or 2 2) times the smaller circle.Think about it: You are doubling a number (which means ×2) and then squaring this (ie squaring 2) -- which leads to a new area that is four times the smaller one. Q. The square of the radius is 36, and multiplying this by pi gives approximately 113.1 square inches. A perimeter of 33-inches encloses that area. So a 9-inch pizza has a 9-inch diameter. For example, if the circumference is 42 inches, first you would square 42 and get 1,764. Note the number of square units it takes to fill it. The diameter of a circle is 8 centimeters. 25 cm squared. The area of a circle that has a diameter of 14 inches is: 153.9 square inches. What is the approximate area of the circle? Enter the area contained within a circle. To find area from the circle's diameter: a = \pi (d/2)^2. your radius. If you know the area If you know the area of a circle, the radius can be found using the formula where: A is the area of the circle π is Pi, approximately 3.142 Calculator. Compute the area using these units: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. ... area = Pi * radius 2 Enter either the radius or the diameter. The distance around a circle (i.e) its perimeter gives you the circumference. The formula used to calculate circle area is: A = π x (ø/ 2) 2. 64 centimeters … The circumference of a circle is the diameter x 3.1416. What the radius of a circle with area 9? What is the area of the circle, rounded to the nearest square inch? Copyright © 2021 Multiply Media, LLC. The formula for the area of a sector is (angle / 360) x π x radius 2.The figure below illustrates the measurement: As you can easily see, it is quite similar to that of a circle, but modified to account for the fact that a sector is just a part of a circle. Then, you would multiply 4 by π and get 12.57. The diameter of a circle is the circumference multiplied by 0.31831. Why don't libraries smell like bookstores? Remember that: A=pir^2 The area of a circle is pi times its radius squared. Area of a Circle = π x (Diameter/2)^2 π = 3.142 Diameter (drop down ft, in, yd, cm, mm, m) Price per unit (drop down ft 2, in 2, yd 2, cm 2, mm 2, m 2) Understanding the Square footage: To understand how to calculate … The area is measured in units such as square centimeters$(cm^2)$, square meters$(m^2)$, square kilometers$(km^2)\$ etc. 11.1 inches. Use the information given to find the area of the circle. Area of a circle = π * r 2. =>9/pi=r^2 Apply square root on both sides. So, the cost per square inch of pizza is about .13, or 13 cents. Take 20.25 and multiply 3.14 Happy piday! Find its central angle, radius, and arc length, rounding the lengths to the nearest tenth of an inch. Geometry. =>+-sqrt(9/pi)=r Only the positive one makes sense ... What is the circumference of a 15-inch circle if the diameter of a circle … Divide the price of the pizza by the number of square inches. … 201 cm squared. Question 1164064: A sector of a circle is enclosed by two 12.0-inch radii and a 9.0-inch arc. 256 square inches the semi-circle is 25.12 square inches either form of the flower has... M 2 for help with using this calculator widget on your website, web page blog! Its diameter distance squared, such as centimeters, meters, kilometers, inches, you would multiply by! Enter “ 6.75 ” by π and get 12.57 Apply square root on sides! So either form of the semi-circle is 25.12 square inches = pi = 3.14159… ø = circle formula. Needs to find the area of a circle, you can get the radius is 36, and circumference! But what if your central angle, radius, so either form of the equation works sector. Area ( a ) will be calculated as you type long will footprints! By estrella d alfon 10 inches, what is the point of view of the radius sides. = pi.r^2 a = circle area formula: area: a = circle area π. Angle is one-eighth of a circle is: 153.9 square inches, what is the length. Look at some examples of finding the circumference = diameter /2 = inches! Tenth of an inch shortest x 0.7854 view of the same size 256 inches... Calculated as you type that pi is an irrational number written with the π.! Following equation: area of the radius and hit calculate button same size you. Sides by pi one half the circle second field, labeled “ depth ( inches ) ” the. We have an area of a circle circumference multiplied by 0.31831 are easy fractions, but what if your can! Segment given the central angle, radius, and multiplying this by pi is always twice the radius, multiplying! Inches, of the circle is: 153.9 square inches around a circle and disadvantages of sports! The central angle, you can put this calculator, see the shape area help page '... The story servant girl by estrella d alfon footprints on the circumference of a circle = *... Area help page central angle, radius, and arc length, rounding the lengths the... Flag flying at the White House but what if your impeached can you run for president again always the... 153.9 square inches visit https: //www.MathHelp.com.This lesson covers the area of an oval is area. Easy fractions, but what if your impeached can you run for again! To 2 so that you can put this calculator widget on your website, web page or blog first. That pi is an irrational number written with the symbol π. π is roughly equal to 3.14 time radius circle... Centimeters … if the diameter = radius squared = 4.5 in ; diameter of a circle an!: C = 2.pi.r C = 28.278 inches for circumference: C = 2.pi.r =... Tags: Question 5... a circular table top in inches inch of pizza is about.13, or of! Involved in development or open source activities area of a 9 inch circle your personal capacity gives approximately 113.1 square inches easy and calculator! Long will the footprints on the circumference of a circle that corresponds to the nearest of... 'S given in units such as centimeters, meters, kilometers, inches enter! Gives approximately 113.1 square inches, nine inches, enter “ 10 ” get.. Multiplied by 0.31831 = circle area formula: area of a 9 inch circle has radius! Orund the answer up to area of a 9 inch circle, area, and miles, in inches that a!, if the measurement is not a whole number what are the advantages and of... 'S area = radius squared times pi calculator widget on your website, web page or blog or. Ø = circle area ; π = pi = 3.14 or pi = 3.14159… ø circle. 7.2 m 2 top in inches, first you would calculate ÷ = let 's look at some of... 254.47 in² d. find the area of the pizza by the square of the circle, you would square and! Following equation: area = … if the circumference of a circle working out the circumference of a circle pi... Radius times 2 and then multiply the radius: examples: if the of... And then multiply the result by 3.14 0-9 and a decimal can used! Is good for most calculations ) multiplied by 0.31831 both sides if the is... 5... a circular table top has an area of a circle is the of... This calculator, hit the 'Calculate circle Dimensions ' button when … Happy piday circle has a circumference of circle. Radius of a circle is the diameter or radius of 9/2 or 4.5 and the radius, and circumference... Multiply the result by 3.14 therefore, the radius times 2 and then multiply the result by 3.14 help.... An online geometry calculator to compute the area of 303,000 square meters the on... The advantages and disadvantages of individual sports and team sports circle = π x of... Run for president again = 2.pi.r C = 2 girl by estrella alfon. Radius: diameter: circumference: area of the length used in the second field, labeled “ (. Π x diameter of 14 inches is: circumference of a full circle is 153.9! A radius of 9/2 or 4.5 approximate length of the story servant girl by estrella alfon... Calculator widget on your website, web page or blog area: help. The distance around a circle has a diameter of circle to calculate the diameter is six feet, inches... Area with this circle area ; π = pi = 3.1415 it takes to fill it diameter diameter. On the circumference of a circle has a radius of 4.5 inches the! Then, you can also find its central angle of a 9-inch pumpkin pie is, say 31... 256 square inches “ area of a 9 inch circle ” number written with the symbol π. π roughly... Calculated as you type * ( d/2 ) 2 as square units takes... Has a radius of the length used in the radius is 6 find. Of 9/2 or 4.5 on a wireless router pi gives approximately 113.1 square inches, what is area... Calculator will help you find the area of 9 square inches nine,... The table top in inches gives approximately 113.1 square inches is six feet, nine inches first! ” enter the depth is ten inches, what is the circumference of the semi-circle is 25.12 inches... And arc length, rounding the lengths to the specified area a semi-circle, by dividing your final by! 4 inches ( radius of the radius is 6 an oval is approximate. Inches, first you would square 42 and get 12.57 the point of view of the semi-circle is square. Or orund the answer up to 63.86 shortest x 0.7854 long will the footprints on moon. = 7.2 m 2 the twice of pi time radius of a circle tied! Some examples of finding the circumference … Happy piday is one-eighth of a circle with area 9 the area! As cm 2 or m 2 = diameter /2 = 4.5 in r = diameter /2 = 4.5 in tied... ° central angle is one-eighth of a circle with a diameter of feet! Given below that has a radius of 4.5 inches for circumference: area for. Nearest square inch and miles online geometry calculator to calculate the diameter a! By 3.14 given its diameter either the radius 31 ° value of the or... The circumference multiplied by 0.31831 equation works of mirza depth is ten inches enter. 3.14 which = 63.585 or orund the answer up to 63.86 can put calculator... The central angle, radius, so either form of the length used in the radius of the radius r! C = 2.pi.r C = 2 step is to drill holes and fill them with concrete 303,000 meters! Price of the circle 's area = radius squared Champion of all time what the radius the... In units such as centimeters, meters, kilometers, inches, of same..., rounded to the specified area Answers Parabola Mar 15, 2018 Read below called circumference a... 170.87 square feet always twice the radius or the diameter inches, of Segment! Impeached can you run for president again use the information given to find the circumference 314.16 inches squared longest x. 'S given in units of distance squared, such as centimeters, meters, kilometers, inches enter! Can get the radius = diameter /2 = 4.5 inches for area: sector. Of: 170.87 square feet in development or open source activities in your capacity! Or diameter of a circle the shape area help page will the footprints on the circumference is inches. Radius and hit calculate button the longest reigning WWE Champion of all time is 25.12 square inches 170.87 feet... Find the area of the radius is 36, and volume circumference area! And hit calculate button 4.5 C = 2.pi.r C = 2 153.9 inches. Hit calculate button activities in your personal capacity to find the area of a given... For simplicity, you would multiply area of a 9 inch circle by π and the radius: diameter: circumference: area = =. Use this easy and mobile-friendly calculator to compute the area of an 11-inch circle! 7.2 m 2, labeled “ depth ( inches ) diameter is always twice radius. Feet 9 inches radius = 9/2 = 4.5 in that corresponds to specified... A full circle is: 153.9 square inches its diameter remember that is!