Q. 473.7( 3 Votes )

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Answer :

We have a rectangular sheet of dimension 20cm × 10cm


If we fold it along its length, which is 20cm,then the resultant figure


is a cylinder with height ,h = 10cm and


base circumference ,2πr = 20cm


Untitled.png


r = cm


volume of the cylinder = πr2h


= π × × 10


= cm3 = v(say) (eq..i)


Again ,if we fold the rectangular sheet along its breadth ,which is 10cm ,the figure so obtained is a cylinder with height h = 20cm


Untitled.png


And the base circumference 2πr = 10cm


r = =


volume of the cylinder = πr2h


= π × × 20


= cm3 = V(say) (….ii)


i.e. V = 2v


from eqs,(i) and (ii), we see that the volume of A is twice the volume of B.


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