Q. 174.8( 17 Votes )

In the given figu

Answer :

Required area = area of outer circle - area of inner circle - (area of sector OAB - area of OCD)


Given, radius of outer circle, R = 42 cm


Radius of inner circle, r = 21 cm


Angle of sector, θ = AOB = COD = 60°


Also, area of a circle with radius 'r' is πr2


area of a sector with angle θ and radius r is


Using formulas,


Required area


Putting values,






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