# mathematics

A hemispherical bowl has an external radius of 18cm and is made of wood 3m thick. calculate the volume of the wood in the bowl.

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asked by Larry
1. For a (complete) sphere,
volume=(4/3)πr³

The volume of material is the volume of whole sphere (radius r2) minus the volume of empty spherical space (radius r1). The thickness t is the difference between r1 and r2, i.e.
r1+t=r2.

Vm=(4/3)π(r2³-r1³)

The volume of material for a hemisphere is half of that of the whole sphere.

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posted by MathMate

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