Question

Can you explain how to do this?

Answer 1

Answer C
Circle area = pi * r^2
If the area is 36*pi, then r^2 is 36 and r (the radius) is 6.
The perimeter of one of the regions consists of two radiuses and an eighth of the circle's circumference.
Two radiuses=6*2=12
An eighth of the circumference: (2*pi*r)/8 = 2*pi*6/8 = 2*6/8*pi = 1.5*pi
So, the perimeter of a section is 12 + 1.5pi