Question

62. Three semicircles each of diameter 3 cm,
a circle of diameter 45 cm and a
semicircle of radius 4.5 cm are drawn in
the given figure. Find the area of the
shaded region
ICBSE 2017​

Answer 1

Answer:

Area of semi-circle PQR = ½π(9/2)2

= 81π/8 cm2

Area of region circle, A = π(9/4)2

= 81π/16 cm2

Area of region (B + C) = π(3/2)2

= 9π/4 cm2

Area of region D = ½π(3/2)2

= 9π/8 cm2

Area of shaded region = Area of semicircle - Area of circle - Area of region (B + C) + Area of region D

= 81π/8 - 81π/16 - 9π/4 + 9π/8

= 63π/16 cm2

= 99/8 cm2 

=12.37cm2

Explanation:

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