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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
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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

User Guruling Kumbhar
by
8.1k points

1 Answer

7 votes
The formula for the area of a circle is


\pi r^(2)

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


\pi 9^(2) =81 \pi

So the answer is B, 81 pi square feet
User Fakhar Iqbal
by
8.4k points
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