Q. 73.8( 20 Votes )

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

(use π = 22/7)


Answer :

Area of shaded region = Area(Sector OAB)-Area(Sector OCD)




= 102.67 cm2


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