An **angle** is a two-dimensional geometric figure that consists of two rays with a common starting point.

**Measures of angles** are often used with circles and trigonometry.

## Types

- acute angle - measures between 0 and 90 degrees
- right angle - measures exactly 90 degrees
- obtuse angle - measures more than 90 and less than 180 degrees
- straight angle - measures exactly 180 degrees
- reflex angle - measures between 180 and 360 degrees
- perigon angle - measures 360 degrees
- coterminal angle - measures greater than 360 degrees