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Question

A rectangular sheet of paper 30cm×18cm can be transformed into the curved surface of a right circular cylinder in two ways i.e., either by rolling the paper along its length or by rolling it along its breadth. Find the ratio of the volumes of the two cylinders thus formed.
 


Solution

In first case, 
By rolling the paper along its length, the circumference of the base = 30 cm and height (h) = 18 cm 



Radius = Circumference2π
= 30×72×22=10522 cm

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