WAEC 2023 · Paper 1 · Q40

An equilateral triangle has a side of $2\text{ cm}$ . Calculate, in cm, the height of the triangle.

Worked solution (try it first)

The height from the top meets the base at its midpoint, making a right-angled triangle with hypotenuse 2 cm and base 1 cm.
Pythagoras: $h^2 = 2^2 - 1^2 = 3$ .
So $h = \sqrt3$ cm, option A.