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OpenStudy (anonymous):
How do you find the surface area of a circle?
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OpenStudy (anonymous):
A circle doesn't have a surface area, only three dimensional shapes have a surface area. Do you mean a sphere?
OpenStudy (anonymous):
yes! sorry!
OpenStudy (anonymous):
The surface area of a sphere is equal to 4 times pi times the radius squared: \[SA_{sphere}=4\pi r^2\]
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