JAMB - Mathematics (2021 - No. 3)
What is the rate of change of the volume V of a hemisphere with respect to its radius r when r = 2?
8π
16π
2π
4π
Explanation
\(V = \frac{2}{3} \pi r^{3}\)
\(\frac{\mathrm d V}{\mathrm d r} = 2\pi r^{2}\)
\(\frac{\mathrm d V}{\mathrm d r} (r = 2) = 2\pi (2)^{2}\)
= \(8\pi\)
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