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Question
The internal and external diameters of a hollow hemi-spherical vessel are 21 cm and 28 cm respectively. Find volume of material of the vessel.
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Solution
External radius (R) = 14 cm
Internal radius (r) = `21/2` cm
`2/3pi(R^3 - r^3)`
= `2/3 xx 22/7((14)^3 - (21/2)^3)`
= `44/21(2744 - 1157.625)`
= `44/21 xx 1586.375`
= `3323.83 "cm"^3`
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