noun 下载 🔗分享 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 Examples : "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. " 在琼斯老师的数学课上,萨拉学到,直角三角形中30度角的余弦值,就是这个角的邻边长度除以斜边长度。 math science 与AI对话词汇游戏阅读练习