The centre of each of a set of circles, each of radius 3 , lie on the circle x 2 + y 2 = 25 . The locus of any point in the set is a ring whose area is λπ , then 10 λ =

Question

The centre of each of a set of circles, each of radius 3 , lie on the circle x 2 + y 2 = 25 . The locus of any point in the set is a ring whose area is λπ , then 10 λ ​ =

TestHub · Accepted Answer

From figure it is clear that point will lie between two concentric circles x 2 + y 2 = 4 and x 2 + y 2 = 64 ∴ Required locus 4 ≤ x 2 + y 2 ≤ 64

Mathematics - Circle Question with Solution | TestHub

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