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Question

Mark the correct alternative in each of the following:

In a cylinder, if radius is doubled and height is halved, curved surface area will be

(a) halved

(b) doubled

(c) same

(d) four times


Solution

Let S1 be the curved surface area of the cylinder with radius r1 and height h1, then

……. (1)

Now, let S2 be the surface area after changing the dimension, then

So,

Hence, the correct option is (c)


Mathematics
RD Sharma (2017)
Standard IX

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