Question

In a circle, a 90° sector has area 16π ft2. What is the radius of the circle?

Answer 1

Sector area  = 0.5 * r^2 * angle (in radians)

so:

16 pi = 0.5 * r^2 * (90*pi/180)

r^2 = 16 pi /(0.25 pi) = 64

r = 8


therefore it would be d