Question

In a circle, a 90° sector has area 36π ft2. What is the radius of the circle?
A. 18 ft
B. 16 ft
C. 6 ft
D. 12 ft

Answer 1

a 90° sector takes up 90/360 = 1/4 of a full circle


so if the area of this sector is 36pi square feet, then the total area of the circle is 4*36pi = 144pi square feet

Answer 2

what this means is that we can use this to find the radius

A = pi*r^2

144pi = pi*r^2

now solve for r

Answer 3

12?

Answer 4

yep

Answer 5

thank you