Find the suface area of a sphere with a radius of 8

Volume of a Sphere: V = (4/3)(pi)(r^3)
Surface Area of a Sphere: SA = (4)(pi)(r^2)

Surface Area of a Sphere when r = 8;
SA = 4*pi*(8^2) = 4*64*pi = 256*pi

SA = 256*pi units^2

surface area = 4pi r^2 = 4pi 8^2 = 128 pi

A = 4 π r²
A = 4 π (64)
A = 256 π units ²