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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Find the area of RS Aggarwal - Mathematics