Q. 3 B4.3( 58 Votes )

# <span lang="EN-US

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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