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What Is a Reflex Angle? (Mathematics Lesson)

What Is a Reflex Angle?

An reflex angle is an angle greater than 180° and less than 360°.



A reflex angle is greater than a straight line and less than a complete revolution.

Real Examples of Reflex Angles

The angles below are all reflex angles:



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Note
WHAT'S IN A NAME?

Reflex comes from the Latin word 'reflexus' meaning "bent back".

A reflex angle looks like it has been bent back on itself.

OTHER TYPES OF ANGLES

Obtuse angles are one type of angle, the other types are acute, right, obtuse, straight and full.

BE CAREFUL WHICH ANGLE TO USE

If there is a reflex angle between two lines, there will also be an acute or obtuse angle between the same two lines.



Be careful which angle you need to use.