Types of Angles (Math Lair)

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Angles can be classified according to their measurement:

Name Definition Example
Acute angle An angle measuring less than 90° [Acute angle]
Right angle An angle measuring exactly 90° [Right angle]
Obtuse angle An angle measuring more than 90° but less than 180° [Obtuse angle]
Straight angle (or flat angle) An angle measuring exactly 180° [Straight angle]
Reflex angle An angle measuring greater than 180° but less than 360° [Reflex angle]
Full angle An angle measuring exactly 360° [Full angle]

Name	Definition	Example
Acute angle	An angle measuring less than 90°
Right angle	An angle measuring exactly 90°
Obtuse angle	An angle measuring more than 90° but less than 180°
Straight angle (or flat angle)	An angle measuring exactly 180°
Reflex angle	An angle measuring greater than 180° but less than 360°
Full angle	An angle measuring exactly 360°