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What is the exact area of a circle with a diameter of 18 feet?

A. 36π square feet

B. 81π square feet

C. 324π square feet

D. 1296π square feet

Respuesta :

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The formula for the area of a circle is 

[tex] \pi r^{2} [/tex]

We know the diameter, and the radius is half of the diameter.  So the radius is 9.  Now we plug that into the formula.

[tex] \pi 9^{2} =81 \pi [/tex]

So the answer is B, 81 pi square feet

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