Study Set:
Geometry Shapes Perimeter Test Questions

Find the circumference of a circle with a diameter of 15.

The circumference of a circle is denoted by the formula C=2∗π∗r where r is the radius of the circle. The problem gives us the diameter of the circle which must be used to find the radius.

radius=Diameter/2

r=15/2=7.5

Plug the radius into the formula for the area of a circle

C=2∗π∗7.5=15π

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