What is the approximate perimeter of a semicircle with a radius of 9mm? Use pi as 3.14. Express your final answer to the nearest hundredth.

Question

asked Jun 20, 2016 140k views

2 Answers

Nsheff · Answer 1 · 2016-06-24T04:05:27+0000

Act like it's a whole circle and find the perimeter, then divide by 2.

P = 2 * pi * r

P = 2 * 3.14 * 9

P = 56.52

Now divide by 2:

P = 28.26