Question

In a circle, a 90° sector has area 64π ft2. What is the radius of the circle?

Answer 1

the area of a circle is Pi R² and u do the calculation 

Answer 2

s-area of a sector
S=πr^2n°/360°
r^2=360°S/πn°
=360°64π/90°π
=64*4
r=√4*4*4*4(64=4*4*4)
r=16ft