Question

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15) Fill in the blanks :
If R' and r the radius of two concentric circle such that R>r then, area enclosed by the two circle
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Answer 1

Answer:

$area \: enclosed \: by \: two \: circle = 2\pi( {rr}^{2} - {r}^{2} )$

here double (rr) is radius of bigger circle .

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