Given radius of a circle, write a program to find its circumference.
Input : 2 Output : Circumference = 12.566 Input : 8 Output : Circumference = 50.264
In a circle, points lie in the boundary of a circle are at same distance from its center. This distance is called radius. Circumference of a circle can simply be evaluated using following formula.
Circumference = 2*pi*r where r is the radius of circle and value of pi = 3.1415.
Circumference = 31.415
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