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ZanzabumX [31]
3 years ago
7

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

Mathematics
1 answer:
Kitty [74]3 years ago
7 0
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
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