What is the arc length of a semicircle if the diameter is 10?

Please help me with this! I have tried and tried and just couldn't get the answer! PLEASE HELP ME!!! DX

1 Answer
Mar 19, 2018

15.71

Explanation:

The arc length of a circle has it's own formula:

m360πd

m=angle measure of arc
d=diameter

Since this is a semicircle, the angle measure of the arc is going to be 180. And they said that the diameter is 10, so we can update the formula:

http://www.mathcaptain.com/geometry/arc-of-a-circle.htmlhttp://www.mathcaptain.com/geometry/arc-of-a-circle.html

m360πd

180360π(10)

0.5π10

5π

Use your calculator to find the value of 5π or use the number 3.1415927 for π if you have to do it manually.

5π=15.71

So the arc measure of the semi circle is 15.71