Question

the capacity of closed cylindrical pipe of height 1 m is 15.4 litres how many square metre of metal sheet would be needed to make it

Answer 1

Given height of the cylinder, h = 1 mCapacity of the cylinder = 15.4 litres V = 0.001 x 15.4 = 0.0154 cu m That is πr2h = 0.0154 r2 = (0.0154 x 7) / (22 ) = 0.0049Hence r = 0.07 m Total surface area = 2πr(r + h) = 2 x (22/7) x (0.07)(0.07 + 1) = 0.4708 sq m