formula to find the circumference end radious

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http://www.mathgoodies.com/lessons/vol2/circumference.html
Circumference = 2 (pi) radius

That is (2) times (3.14) times the (radius)

The radius is half of the diameter
Circumference = 2 (pi) radius

That is (2) times (3.14) times the (radius)

The radius is half of the diameter
Circumference= 3.14 (pi)*diameter. Or. 3.14*radius to the 2nd power. Hey should both equal the same answer.