Question

circle O has a radius of 12 inches. find the exact length of semicircle HJI.

Answer 1

Answer:

$12\pi\ in$

Step-by-step explanation:

we know that

The length of a circle is equal to the circumference

$C=2\pi r$

where

r is the radius of the circle

In this problem we have

$r=12\ in$

The length of semicircle is equal to

$C=\pi r$

substitute

$C=\pi (12)$

$C=12\pi\ in$

Answer 2

Answer:

12pi

A semicircle is exactly half of a circle.

C = 2pi(r) (for full circle)

C = pi(r) (for half of a circle)

C = pi(12)

The exact measure is 12 pi inches