expression
formed angle; angle made
Mathematical term for the angle formed by two lines or vectors; often used in the pattern ...のなす角.
二直線のなす角を求めよ。
Find the angle formed by the two lines.
ベクトル a と b のなす角を θ とする。
Let θ be the angle between vectors a and b.
角度 is the general word for 'angle' as a measurable quantity, while なす角 specifically refers to the angle formed by two given lines or vectors.
Compound of the verb なす (成す, 'to form') and 角 (かく, 'angle'), literally 'the angle that is formed'.