NECO 2023 · Paper 1 · Q48

Solid mensuration

If 1.109 litres of water is poured into a cylindrical container of base radius $4.2\text{ cm}$ , find the level of water, correct to two significant figures.

Worked solution (try it first)

Change litres to cm³: 1 litre is $1000\text{ cm}^3$ , so the water is $1109\text{ cm}^3$ .
Base area: $\frac{22}{7} \times 4.2^2 = 55.44\text{ cm}^2$ .
Level $= 1109 \div 55.44 \approx 20.00$ cm, option D.

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