Question

Suppose the diameter of a circle is 9. What is its circumference?

Answer 1

If the diameter of a circle is 9 inches, you would multiply that by 3.14 to find out about what the circumference is.

Diamater ×
`\pi` = Circumference

9 × 3.14 = 28.26 inches.

Answer 2

The circumference of any circle is pi times its diameter.
For this circle, that's 9 pi.