Question

Find the arc length of AB if the
circumference of this circle is 187.

Answer 1

π

Explanation:

a circle contains 360° in total, so given it's circumference (lets say C),

the length of an arc with angle α is (α/360)*C
for our exanple, the length of arc AB, will be (20/360)*C
as C is given to be 18π cm, we can calculate:

Length(AB) = (20/360)*18π = π