Question

The radius of a circle is 15 inches. What isthe circumference of the circle? Writeyour answer using PI.

Answer 1

The circumference formula is

$C=\pi d$

Where the diameter is double the radius.

$d=2r=2(15)=30$

The diameter is 30 inches.

Now, we find the circumference.

$C=30\pi$

Therefore, the circumference is 30pi, or 94.2 inches.