## Elementary Geometry for College Students (6th Edition)

l $\approx$ 7.33 in
The central angle corresponding to a circular brake shoe measures 60° We need to find out the length of curved surface of the brake shoe if the length of radius is 7 in. In a circle whose circumference is c, the length l of an arc whose degree measure is m is given by l =$\frac{m}{360}$ * c c = 2*$\pi$ * r =2 * $\frac{22}{7}$ * 7 = 44 in m=60° l=$\frac{60}{360}$ * 44 = 7.33 in