Question

What is the approximate distance around the half circle with radius 12 centimeters?

A.
18.8 centimeters

B.
37.7 centimeters

C.
75.4 centimeters

D.
150.7 centimeters

Answer 1

You can find the perimeter of a circle by using the radius.
circumference = 2
`\pi r`
Circumference = 2
`\pi x 12`
circumference = 24 pi
Since you are only trying to find half of the circle you would divide your answer by 2

24pi / 2 = 12 pi

12 pi = 37.68

The answer is B. 37.7