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Snowcat [4.5K]
3 years ago
11

The following three shapes are based only on squares, semicircles, and quarter circles. Find the perimeter and the area of each

shaded part. Give your answer as a completely simplified exact value in terms of π (no approximations).

Mathematics
1 answer:
Agata [3.3K]3 years ago
8 0
First compute the area of the square like this: 9^2=81
There is two semi circles here, so the sum of the two white 
spaces equate the area of a circle. 
the radius of the circle is 9/2. 
So compute the area of the like this:  \pi (\frac{9}{2})^2
And the area of the shaded region is the area of the square minus 
the area of the two semi circles, like this:
81-\pi (\frac{9}{2})^2
We are done. 
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