Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 4 - No. 3)
In a right-angled triangle, what is the side adjacent to an angle (other than the right angle)?
The hypotenuse
The side opposite the angle
The side next to the angle
The longest side
Explication
The adjacent side is next to the reference angle (and not the hypotenuse).