Question

very very hard or say hardest question......
the volume of a cylindrical pipe is 1650cm³ and its curved suface area is 660cm², find its radius and height

Answer 1

Volume Of cylinder Лr^2*h = 1650 cm^3
                     so, r^2*h = 1650*7/22 = 525 .......................(1)

And We are given, 2Лrh = 660
                           so, rh = 330*7/22
                               rh = 105
                         so, r^2h = 105r ...........................................(2)
     BY Eqn. (1) & (2)

            105r=525
          so, r = 5cm

and (5)^2*h = 525
        so, h = 525/25 = 21 cm

So, Radius = 5cm and Height = 21 cm 

Dude

Answer 2

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