Maths Dictionary · JSS 3, SS 1
Adjacent side
Simple meaning
In a right-angled triangle, the side next to the angle you are using (but not the hypotenuse).
Example
In cos θ = adjacenthypotenuse, the adjacent side touches θ.
See it
From the Sine, Cosine and Tangent lesson. Try moving things around.
sin 37°opphyp6.02 ÷ 100.6018
cos 37°adjhyp7.99 ÷ 100.7986
tan 37°oppadj6.02 ÷ 7.990.7536
Change the hypotenuse: the sides change, but the ratios for the same θ stay the same.
Angle θ37°
Hyp.10