Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 2)
Which information is required to use the formula for the area of a triangle: 1/2 * base * height?
All three sides.
Two sides and an included angle.
The base and the perpendicular height to that base.
Two angles and any side.
Explication
You need the base and the perpendicular height.