If a circle has a diameter of 10 inches, what is the circumference?

2 Answers
Feb 22, 2018

10pi

Explanation:

The equation for circumference is 2pir

You are given the diameter, which is double that of the radius. Therefore, the radius is 10/2=5 inches

Substituting this into the equation will give you
2pi*5 = 10pi

Feb 22, 2018

10pi~~31.4 inches

Explanation:

Circumference of a circle can be given by the equations:

C=2pir or C=pid

Here, it would be easier for us to use the second equation, as we have the diameter.

:.C=10pi~~31.4 inches