A hemispherical bowl of internal and external diameters 6 cm and 10 cm is melted and formed into a right circular cylinder of radius 14cm . Find the height of the cylinder .

Let the internal and external radii of hemisphere be r , R respectively.
radius of cylinder be r'..
R = 10/2 = 5cm
r = 6/2 = 3 cm
volume of hemisphere = volume of cylinder
2/3*π(R3-r3) = πr'2h
2/3*98 = 196h
h = 2/3 * 98/196 = 1/3cm = 0.33cm

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 thanks a lot !

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