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OpenStudy (anonymous):
How would you find the surface area of a sphere if the circumference is 3pi
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myininaya (myininaya):
circumference=C=2pi*r and surface area=SA=4pi*r^2. Since SA=2*C*r, all we need to know is r. And since C=3pi=2pi*r then r=3/2.
myininaya (myininaya):
so SA=2*C*r=2*3pi*3/2=9pi
OpenStudy (anonymous):
huh
myininaya (myininaya):
huh what?
myininaya (myininaya):
can you plug the circumference into the surface area formula?
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myininaya (myininaya):
yes
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