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The radius is the circumference divided by 2 x pi.

C= pi(2r)

R=C/2pi

Divide the circumference by Pi (about 3.1416). This gives you the diameter. Now divide the diameter by two to get the radius.

Divide the circumference by pi divided by 2

Visit the website in the related link. The formula (any algebraic expression) for the different parts of the circle are on there, and it explains it very well.

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Q: How do you find the radius of a circle when given the circumference?

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circumference of a circle = 2*pi*radius or pi*diameter

Diameter of a circle = 2*radius Circumference of a circle = 2*radius*pi

If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.

If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)

To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi

Divide the circumference by (2*pi)

Circumference of a circle: 2 x pi x radius.

find the radius of a circle with circumference of 42.1

Divide the circumference by the value of Pi, then halve that result.

Square root (Area/pi) to get the radius Then 2xRadiusxPi= Circumference

That will depend on the length of the radius which has not been given but in general the circumference of a circle = 2*pi*radius or diameter*pi

To find the radius of a circle when given the circumference, you should start with the formula for circumference, which is this: circumference = 2*pi*radius To solve for the radius, you would the have to divide the circumference by 2*pi leaving you with a formula like this: radius = circumference/(2*pi) pi≈3.14159

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