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a circle has a radius of 8 inches.what is the circumference of the circle?

 

Diameter=radius X 2

D=8 X 2=16 inches

Circunference=Diameter X Pi

C=16 X 3.141592=50.265472 inches.

You would use π x the diameter of the circle. the diameter of the circle is 16 because 2 radii equal 1 diameter. 2x8=16, so 16 is the diameter.

 

Let's substitute 3.14 for π or pi.

 

16x3.14= 50.24. The circumference of the circle is 50.24 in.