Adjacent Side (Triangle) Definition
In geometry, an adjacent side of the triangle is defined as the side located next to the given angle. It is also known as the non-hypotenuse side.
In general, these adjacent triangle sides are formed next to an angle and contains more than one side, but in the case of a right-angle triangle, a single adjacent side is formed between the angle and right angle, as shown in the below image.
If you want to know about adjacent faces, you can use our Adjacent Faces Definition.