Q29 of 37 Page 13

AB and CD are arcs of two concentric circles of radii 21 cm and 7 cm respectively and centre O. If ∠AOB =30°, find the area of the shaded region.

Area of the shaded region


= Area of sector AOB – Area of sector COD


Area of sector AOB


Here, radius = 21cm and θ = 30°






Area of sector COD


Here, radius = 7cm and θ = 30°






Now, shaded region = Area of sector AOB – Area of sector COD






Hence, area of shaded region is cm2


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