Question

What is the surface area of a sphere with radius of 3.5? A. 12.25p B. 14p C. 24.5p D. 49p

Answer 1

S=4πr2 - this is the equation for the surface area of a sphere. We know that the radius (r) is 3.5 so here's how  to solve this:

S = 4π r2
S = 4π (3.5)2
S = 4π 12.25
S = 49π 

The surface area of a sphere with radius of 3.5 is 49π.