The legs (or catheti; singular: cathetus) are the sides in a right triangle that form its right angle (90°). The side opposite the right angle is called the hypotenuse. The legs (or catheti) are the two shorter sides of the triangle.
This two legs are defined according to the acute reference angle α:
- Adjacent leg: side that forms the right angle and is adjacent to angle α.
- Opposite leg: side that forms the right angle and is opposite to angle α.
Keep in mind that the labels “opposite” and “adjacent” depend on which angle you are talking about. If the reference angle is not angle α but angle β (the upper one), the adjacent and opposite legs are reversed.
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Note. Courtesy of the author: José María Pareja Marcano. Chemist. Seville, Spain.
Relationship between Legs and Hypotenuse
AUTHOR: Bernat Requena Serra