# math

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

• math -

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

• math -

so its 225pi sq. in?

• math -

exact? One cannot write down exactly irrational numbers, such as PI.

The exact answer is 225/4 * PI

• math -

pi r^2 = pi D^2/4 = area of circle

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