Posted by **jenna** on Monday, July 4, 2011 at 4:00pm.

what is the exact area of a circle with a diameter of 15 inches?

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**Damon**, Monday, July 4, 2011 at 4:01pm
radius = 15/2

area = pi r^2 = pi (225/4)

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**jenna**, Monday, July 4, 2011 at 4:09pm
so its 225pi sq. in?

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**bobpursley**, Monday, July 4, 2011 at 4:42pm
exact? One cannot write down *exactly* irrational numbers, such as PI.

The exact answer is 225/4 * PI

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**Damon**, Monday, July 4, 2011 at 5:01pm
pi r^2 = pi D^2/4 = area of circle

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