noun
adjacent side; cathetus
In a right triangle, the side adjacent to a given acute angle; the leg that is not the hypotenuse. Used in geometry and trigonometry.
直角三角形の隣辺の長さを求める。
Find the length of the adjacent side of the right triangle.
余弦は隣辺と斜辺の比である。
Cosine is the ratio of the adjacent side to the hypotenuse.