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Circumference=2*pi*radius

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Q: What formula is used to find the circumference when you know the radius?

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use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference

A=pi times r times r

Area = radius x radius x pi. (Radius is half the diameter and pi is near enough 3.14 )

It depends on the information that you do have. If you know the diameter, the circumference or the area the equations are relatively straightforward.

The formula is: circumference = 2 x pi x radius. As always when you use a formula, plug in the values you know and solve for the ones you don't. So plug in 46 for the circumference and solve for the radius. (You'll get that the radius = (circumference)/(2pi)).

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use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference

the Circumference is pi times 2 times radius If you know circumference then you can find the radius. once you know the radius just multiply by 2 to find the diameter.

Where C=circumference, r= radius and d=diameter To find circumference: C=2 x pi x r or you can use the formula C=pi x d To find diameter just multiply the radius by 2 if you know what the radius is. If you do not know the radius, but you know the circumference and need diameter use the following formula: C/pi=d Happy Computing!!!

Circumference = 2*pi*radius

A=pi times r times r

Area = radius x radius x pi. (Radius is half the diameter and pi is near enough 3.14 )

Circumference = 2 x pi x radius

It depends on the information that you do have. If you know the diameter, the circumference or the area the equations are relatively straightforward.

The formula is: circumference = 2 x pi x radius. As always when you use a formula, plug in the values you know and solve for the ones you don't. So plug in 46 for the circumference and solve for the radius. (You'll get that the radius = (circumference)/(2pi)).

Circumference of a circle = 2*pi*radius

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

If you know the area, you can find the radius --> A = (pi) * r^2 If you have the radius, you can find the circumference --> C = (pi) * 2 * r

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