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A= big semicircle.. what's next?

50pi

Just remove the semicircle on the left and place it in the gap on the right

this is SAT yes? I remember this one

\[a= \pi*r ^{2}\]
\[a= ( \pi * 10^{2} ) /2 = 157.079\]

Isn't it right?

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the radius is very clearly \(r=10\) ergo the area is \(A=\pi r^2=\pi(10)^2=100\pi\)

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so.. also find that part and add it?

You need to add that because it is also shaded.
The area of that part is 25pi over two.

oh. right

so.. the answer is.. 314.16 right?
thanks guys

@stupidinmath no it's half of that, i.e. \(50\pi\)

oh.. since its a semi circle.. k thanks :)