noun🔗Share余弦In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos"In Mr. Jones' math class, Sarah learned that the cosine of a 30-degree angle in a right triangle is the length of the adjacent side divided by the length of the hypotenuse. "ジョーンズ先生の数学の授業で、サラは直角三角形における30度の角度の余弦は、隣接する辺の長さを斜辺の長さで割ったものだと学びました。mathscienceChat with AIVocabulary GamePractice Reading