find area of shaded region
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bigger circle
A=πr^2
A=π7^2
A=153.9
small circle
A=πr^2
A=π3.5^2
A=38.4
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d of outer circle=14+7
=21
its r = 21/2
=10.5
A=πr^2
A=π10.5^2
A of outer circle=346.36
A of shaded part = 346.36/2
=173.18
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