SOLUTION: Find the surface area of a sphere if the circumference measures {{{12*pi}}}

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Question 681327: Find the surface area of a sphere if the circumference measures 12%2Api

Answer by MathMan88(14) About Me  (Show Source):
You can put this solution on YOUR website!
First find the diameter
c=d%2Api
12%2Api=d%2Api
d=12%7D%7D%0D%0AThen+solve+for+radius%0D%0A%7B%7B%7Br=d%2F2
r=12%2F2
r=6
Then plug in d into surface area equation
SA=+4%2Api%2A%28r%29%5E2
SA=+4%2Api%2A%286%29%5E2
SA=+4%2Api%2A36
SA=+144%2Api