SOLUTION: what is the surface area of a sphere with a radius of 20 inches?

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Question 399906: what is the surface area of a sphere with a radius of 20 inches?
Found 2 solutions by mananth, Edwin McCravy:
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
surface area of sphere = 4*pi*r^2
r=20
4*pi*20^2
= 5,026.54 in^2

Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
A = 4Пrē
A = 4П(20 in)ē
A = 4П(20ē) inē
A = 4П(400) inē
A = 1600П inē
A = 5026.548246 inē