volume of a sphere

Question

Find the volume of a sphere whose circumference is 8π feet.

Answer 1

V = 4/3)pi(r^3)

Circumference = 2pi(r) = 8pi

r = 8pi/2pi = 4 feet = radius

V = (4/3)pi(4)^3 = 256pi/3 = about 256(3.14)/3 = 803.84/3 = 267.95 cubic feet