Q. 3 B4.3( 58 Votes )

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Answer :

Diameter of bigger semicircle, D = 21 cm

Radius of bigger semicircle, R = D÷ 2



Diameter of smaller semicircle, d = 21 cm


Radius of smaller semicircle, r = d÷ 2





A1 = 173.25 sq.cm


Similarly,


A2 = 43.31 sq.cm


Area of shaded region = 2 × (A1 – A2)


Req. area = 2 × (173.25 – 43.31)


2 × 129.94


259.87 sq.cm


Area of shaded region is 259.87 sq.cm


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