Math
Measuring angles.
Definition
The process of determining the size of an angle using a protractor, measured in degrees. Angles are classified by their measure: acute (< 90°), right (= 90°), obtuse (> 90° and < 180°), and straight (= 180°).
Examples
Real-world.
- 1 Using a protractor to measure a 45° angle
- 2 Identifying a 120° angle as obtuse
- 3 A straight line forms a 180° angle