Radius is half of the diameter - i.e. it is the distance from the centre to the edge of the circle.
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Circumference is equal to pi x diameter Diameter is equal to 2 times the radius Circumference would be 2 x pi x radius
2 x Pi x r is equal to the circumference of a circle whose radius is equal to r.
true
The circumferance of a circle is equal to 2 x pi x r, where r is the radius, i.e. approximately 6.2832 than its radius. Divide the circumferance from the figure above to get the radius of a circle in which the circumferance is known.