Question

The radii of two cylinders are in the ratio 3:5 . If their heights are in the ratio 2:3, then the ratio of their curved surface areas i

Answer 1

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Answer 2

CSA of 1st cylinder= 2πrh

= 2π×3×2

CSA of 2nd cylinder= 2πrh

= 2π×5×3

CSA of 1st cylinder/CSA of 2nd cylinder

= 2π×3×2/2π×5×3

=6/15 or 2/5

=2:5

Ratio of CSA of both cylinders=2:5

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