出典:Wiktionary
出典:『Wiktionary』 (2025/09/04 20:09 UTC 版)
From Latin cathetus, from Ancient Greek κάθετος (káthetos, “perpendicular”).
cathetus (plural catheti or cathetuses)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/04 09:13 UTC 版)
In a right triangle, the cathetus (originally from the Greek word Κάθετος; plural: catheti), commonly known as a leg, is either of the sides that are adjacent to the right angle. It is occasionally called the periphrasis ("side about the right angle"). The side opposite the right angle is the hypotenuse. When referring to the hypotenuse, the catheti are often referred to simply as "the other two sides".