Question

URGENT PLZ HELP
Find the arc length of semi circle with diameter of 18

Answer 1

Explanation:

The formula to find arc length is

`AL=(\theta)/(360)*\pi d` where theta is the measure of the central angle and d is the diameter. If we are dealing with a semicircle, the measure of the central angle is 180 degrees. Filling in:

`AL=(180)/(360)*\pi (18)` which simplifies a bit to

`AL=(1)/(2)*\pi (18)` and a bit more to

AL = 9π. That answer is obviously in terms of π; if you need it in terms of whatever your measurement is (feet, inches, cm, etc.) the answer would be, rounded to the nearest tenth, 28.3 units