Question

In the figure, sector of two concentric circles of radii 7cm and 3.5cm are given. Find the area of the shaded region. ​

Answer 1

Step-by-step explanation:

area of the shaded region is big sector area - small sector area .

as (pi R square Q/360) - (pi r square Q/360)

as R=> 7 and r=> .3 .5

assume That Q is 30

& 22×7×7×30/360×7=>22×7/12 =>77/6.

22×7×7×30/360×2×2=> 77×7/24=> 539/24=>

77/6-539/24=> 77(24)-539/24.=>1848-5,39 /24=> 1309/24=> .54 . 54 cm square.

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