How to find the area of gray portion in the image ?

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How to find area of gray portion in the image ?

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To find the area of gray portion, we  use the below equation

Area of gray portion = Area of the semicircle on the Left hand side – Area of semicircle with diameter 2.6 cm + Area of semicircle with diameter 1.8 cm

=> 0.5 * π[0.5*(2.6+1.8)]^2 – 0.5*π(1.3)^2 + 0.5*π(0.9)^2

=> 6.22035345411 sq cms

Hope that helps !!

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