# APB and CQD are semicircles of diameter 7 cm each. ARC and BSD are semicircles of diameters 14 cm each. Find the perimeter of shaded region. [Use pi=

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APB and CQD are semicircles of diameter 7 cm each. ARC and BSD are semicircles of diameters 14 cm each. Find the perimeter of shaded region. [Use pi=22/7]

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Perimeter of a semi circle is pir.
Now, radius of semi circle APB and CQD = 7/2cm
Radius of semi circle ARC and BSD = 14/2 = 7cm
:. Perimeter of shaded region (P)= Perimeter of APB+Perimeter of CQD+Perimeter of ARC+Perimeter of BSD
P = pi(7/2)+pi(7/2)+7pi+7pi = 21pi = 21**22/7 = 66cm
:. Perimeter of shaded region is 66cm`.

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