Zhèngjiǎo hé fùjiǎo de fāngxiàng zhènghǎo xiāngfǎn.
Positive and negative angles run in exactly opposite directions.
Tips
mistakes
The same two characters spell 正角, the good-guy role in a play or film. In maths the second character is 角, an angle; on stage it is 角, a role.
usage
School trigonometry vocabulary, defined against 负角, a negative angle. Turning counterclockwise from the starting side gives a 正角, turning clockwise gives a negative one.
