the circumference is two times the radius, or 2r. so if the radius was 3, the circumference would be 6. if the radius was 4, the circumference is 8.
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2*pi*radius = perimeter or circumference of a circle radius = circumference/2*pi
It is the formula for finding the circumference of a circle which is the same as 2*pi*radius
The formula for the circumference of a circle is pi * diameter or (2 radius.)
Divide by 3.14 then by 2
1/2 diameter or the circumference/pi/2