Angle Types Explorer
Understanding Straight and Reflex Angles
Definitions
Straight Angle: An angle that measures exactly 180°
Reflex Angle: An angle that measures greater than 180° and less than 360°
Straight Angle ∠XOY
Points X, O, and Y form a straight line
Reflex Angle ∠MON
The reflex angle is the larger arc between rays OM and ON
Interactive Reflex Angle
Drag the slider to explore different reflex angles (181° - 359°)
Key Points to Remember
- • A straight angle always measures exactly 180° and forms a straight line
- • A reflex angle is always the larger angle between two rays (greater than 180°)
- • The sum of a reflex angle and its corresponding acute/obtuse angle is 360°