A solid metallic hemisphere of radius 8 cm is melted and re-casted into a right circular cone of base radius 6 cm. Determine the height of the cone.

For hemisphere,


Radius, r = 8 cm


As we know,


Volume of hemisphere


Where, r = radius of hemisphere


Volume of given hemisphere


For cone that is recast from hemisphere,


Base radius, r = 6 cm


We know that,


volume of cone


Where, r is base radius and h is the height of the cone.


Now,


Volume of cone


As the volume remains same, when a body is reformed to another body


Volume of cylinder = Volume of cone


12πh = 1024π /3


h = 28.44 cm


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