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.

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asked Feb 7, 2018 in Mathematics by Kundan kumar (49,132 points) 34 441 1403

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

+1 vote
answered Feb 7, 2018 by Vikash Kumar (144,729 points) 8 11 26
 
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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