Mathematics
OpenStudy (anonymous):

How do you find the circumference of a circle

The circumference of a circle given the radius is defined as $$2\pi r$$.

OpenStudy (anonymous):

ok. in the circle there is 5cm. How do I figure this

If 5cm is the radius, then you multiply it by $$2\pi$$. If it is the diameter, then the radius is 1/2 of that number.

OpenStudy (anonymous):

so the answer would be 15.7