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Mathematics 19 Online
OpenStudy (anonymous):

How do you find the surface area of a circle?

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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