Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 1)
Which trigonometric ratio is used to find the angle when you know the adjacent and the hypotenuse sides?
Sine
Cosine
Tangent
Cosecant
הֶסבֵּר
Cosine = Adjacent / Hypotenuse (CAH)