In the given figure,find the area of the shaded region, enclosed between two concentric circles of radii
7 cm and 14 cm where angleAOC = 40 degree
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area of outer circle = 22/7 ×14×14=616 cm2
area of inner circle =22/7× 7×7 =154cm2
area of sector of outer circle =40/360×616
area of sector of inner circle =40/360×154
area of shaded area =616-154-(616/9)+(154/9)
=462-(616+154)/9
=462-(870/9) cm2
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