Circumference is calculated by 2pr
So if you know the circumference, divide by 2, and then divide by p
That answer will be the radius
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The circumference is twice the radius. In other words, if you know the radius, multiply it by 2 to get the circumference.
Circumference=2*pi*radius
You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).
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
radius = circumference/2*pi