The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.
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If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .
radius = diameter/2 radius = circumference/2*pi
The radius would be about 2. To figure out the circumference it is (2)(3.14)(the radius). So I just reversed the situation to (12.62) / (3.14) / (2).
Circumference = 2*pi*radius or diameter*pi
Circumference = 2*pi*radius Radius = Circumference/(2*pi)