WAEC 2025 · Paper 1 · Q23✱✱

Solid mensuration

A cylindrical container, closed at both ends, has radius $7\text{ cm}$ and height $5\text{ cm}$ . Find its total surface area. $\left[\pi = \frac{22}{7}\right]$

Worked solution (try it first)

Closed at both ends: the curved surface plus two circles, $2\pi r(r + h)$ .
$2 \times \frac{22}{7} \times 7 \times (7 + 5) = 44 \times 12$
$= 528\text{ cm}^2$ , option B.

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