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Q.

The lateral surface area of a cylinder is equal to the curved surface area of a cone. If the radius be the same, then the ratio of the height of the cylinder and slant height of the cone is

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a

1:3

b

2:1

c

1:2

d

2:3

answer is B.

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Detailed Solution

Given that L.S.A of cylinder = CSA of cone

 2πrh=πrl⇒2h=l⇒hl=12

 h:l=1:2

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