NECO 2024 · Paper 1 · Q42

The base radius and height of a cone are $4\text{ cm}$ and $6\text{ cm}$ respectively. Calculate its volume, correct to the nearest whole number.

Worked solution (try it first)

Volume of a cone: $\frac13\pi r^2h = \frac13 \times \frac{22}{7} \times 16 \times 6$ .
That is $\frac{22}{7} \times 32 \approx 100.6\text{ cm}^3$ .
To the nearest whole number, $101\text{ cm}^3$ , option D.