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1256 inches ++ Another Answer ++ The formula for finding the Circumference of a circle is C = Pi x D where D is Diameter and Pi is 3.1416. The Radius of a circle is one-half of the Diameter, hence the Diameter of a circle with a 20-inch Radius is 40 inches. Using the formula above, multiply 40 x 3.1416 to find the Circumference: 40 x 3.1416 = 125.664 inches.

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Q: If a circles radius is 20 inches what is the circumference?
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Related questions

How do you find the radius of a circle with a circumference of 20 inches?

radius = 20/(2*pi) = 3.183098862 inches


What is the circumference of a radius of 20 inches?

125.664 inches (rounded)


What is the radius of a circle with a circumference of 20 inches?

r = 3.18 inches.


What is the circumference of 20 inches?

The answer will depend on what is 20 inches: the radius or diameter or something else.


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The circumference of a circle is equal to 2 times pi times the radius of the circle. Therefore, if the radius of the circle is 10 inches, the circumference would be 2 times pi times 10 inches, or 20 pi inches. Pi is a mathematical constant with a value of approximately 3.14, so the circumference of the circle would be approximately 62.8 inches.


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(2 x 20 x 3.1415)/(5/360) = 20.94 inches


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The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).


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The radius of a circle whose circumference is 40pi is 20 units.