WAEC 2025 · Paper 1 · Q22✱✱

The diagonals $AC$ and $BD$ of a rhombus $ABCD$ are $16\text{ cm}$ and $12\text{ cm}$ . Calculate its area.

Worked solution (try it first)

The diagonals cut the rhombus into four right-angled triangles, each with legs 8 cm and 6 cm, so each has area $\frac12 \times 8 \times 6 = 24\text{ cm}^2$ .
The rhombus is four of them: $4 \times 24 = 96\text{ cm}^2$ .
This is the same as $\frac12 \times 16 \times 12$ , option A.