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https://vle.mathswatch.co.uk/images/questions/question1175.png

 Oct 7, 2017
 #1
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The radius of the sem-circle is 12mm

 

And its area =  (1/2) pi * 12^2  =  72 pi

 

 

The radius of the small circle is 6mm   and its area  =  pi * 6^2  =  36 pi

 

So....the shaded area is the difference of the two  =  [72 - 36] pi  = 36 pi ≈  113 mm^2

 

 

cool cool cool

 Oct 7, 2017

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