Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 40)
In a right-angled triangle, which side is adjacent to a given acute angle?
The hypotenuse
The side opposite the angle.
The side next to the angle (other than the hypotenuse).
The longest side
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The adjacent side is the side that forms the angle with the hypotenuse.