Posted by Savannah on Monday, March 12, 2012 at 8:41pm.
The area of a circle is given by the formula A+pier^2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100pie square inches, what is the radius of the original circle?

Algebra  Mike, Wednesday, May 9, 2012 at 7:31pm
9 inches.
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