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+2 votes
23.8k views
in Mathematics by (51.7k points)

In Fig.12.15, sectors of two concentric circles of radii 7 cm and 3.5 cm are shown.  Find the area of the shaded region.

1 Answer

+2 votes
by (266k points)
 
Best answer

Let, A1, and, A2 be the areas of sectors OAB and OCD respectively. Then, At =Area of a sector of angle 30º  in a circle of radius 7cm.

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