Question

Find the arc length of the semicircle.

Either enter an exact answer in terms of π or use 3.14 point, 14 for π and enter your answer as a decimal.

Answer 1

28.26 units

Explanation:

circumference equals 2r times pi. radius is 9 so the circumference is 2 x 9 x pi (which is 3.14). This would give is 56.52 but since its a half circle you divide it by two