Science, Maths & Technology
Geometry
...technology courses. Acute angle Any angle that is less than a quarter turn; that is, less than 90°. An example of an acute angle is the angle that a door makes with a doorframe when it is ajar. [Acute angle] Figure ang1 Right angle The angle that corresponds to a quarter turn; it is exactly 90°. The angles at the corners of most doors, books and windows are right...