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Find the area of the shaded region in the given figure, if radii of the two concentric circles with

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Find the area of the shaded region in the given figure, if radii of the two concentric circles with centre O are 7 cm and 14 cm respectively and ∠AOC = 40°.

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Radius of small circle, r = 7 cm 

Radius of big circle, R = 14 cm 

∠AOC = θ = 40° 

Area of shaded part, ABCD =? 

Area of ABCD 

= Area of OAC – Area of OBD

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