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Multiply the radius by 2 to get the diameter. Then multiply the diameter by pi to get the circumference.

Example:

If radius = 2 inches,

diameter = 4 inches

circumference = 4 x pi = 4 (3.1416) or about 12.57 inches

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Q: How do you find the circumference of a circle if you know the radius?
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Related questions

When you know the circumference of a circle how do you find the diameter?

If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)


How do you find the radius of a circle if you know the circumfrence?

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The radius of the circle is 5inches what is the circumference?

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How do you find the radius of a circle if you dont know the circumference?

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How dou find diameter?

You measure it. If you know the radius (of a circle), you multiply it by 2 to get the diameter. If you know the circumference of a circle, you divide by pi to get the diameter.You measure it. If you know the radius (of a circle), you multiply it by 2 to get the diameter. If you know the circumference of a circle, you divide by pi to get the diameter.You measure it. If you know the radius (of a circle), you multiply it by 2 to get the diameter. If you know the circumference of a circle, you divide by pi to get the diameter.You measure it. If you know the radius (of a circle), you multiply it by 2 to get the diameter. If you know the circumference of a circle, you divide by pi to get the diameter.


What is the formula for finding the diameter of a circle when the circumference is given?

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