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First compute the area of the square like this: 
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:
And the area of the shaded region is the area of the square minus
the area of the two semi circles, like this:
We are done.
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:
And the area of the shaded region is the area of the square minus
the area of the two semi circles, like this:
We are done.