noun🔗Share正弦In a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse."In a right triangle with a 30-degree angle, the sine of that angle is 0.5, meaning the side opposite the angle is half the length of the hypotenuse. "30度の角度を持つ直角三角形において、その角度の正弦は0.5であり、これは角度の対辺が斜辺の長さの半分であることを意味します。mathscienceChat with AIVocabulary GamePractice Reading