Posted by **Abigail** on Thursday, March 1, 2007 at 7:40pm.

How do you prove area of a circle?

Integrate an incremental area

dArea = r dr dTheta from r=0 to R, and Theta from zero to 2PI radians.

Area= INT INT dTheta rdr dTheta

Area= 2PI (1/2 R^2)= PI R^2

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