Question

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Answer 1

Answer:

curved surface area of cylinder=2πrh

given.....

2πRH=2πrh

and H/h=1/2

hence..R/r=2:1

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Answer 2

Step-by-step explanation:

Surface area of first cylinder (A1) = 2πrh

Surface area of second cylinder(A2)= 2πRH

According to the question,

A1 = A2

=> 2πrh = 2πRH

=> r/R = 2πH/2πh

=> r: R = H/h

=> r: R = 1 : 2 ( given; h:H = 1:2)

Hence, the ratio of radii of these two cylinders are 1 :2.

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