Circle A has its center at A(4,4) and has a radius of 4 units. Circle B has its center at (12,4) and has a radius of 4 units. What is the perimeter of the gray region bound by the circles and the x-axis? Express your answer in terms of pi.
The bottom part of the shaded area = 8
The length of one of the curved sides = 1/4 circumference of a circle with a radius of 4 =
(2 pi * 4) / 4 = 2pi
So.....the perimeter of the shaded area = 8 + 2 (2pi) = 8 + 4pi units
