Types of Angles
In the last section, you learned about right angles and straight angles. Obviously, not all angles are right or straight.
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If an angle measures more than 0° but less than 90°, the angle is acute. |
Angle ABC below is an acute angle.
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If an angle measures more than 90° but less than 180°, the angle is obtuse. |
Angle DEF below is an obtuse angle.
Sometimes, we are interested in angles larger than 180°.
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When we are measuring the part of the angle that is more than 180°, we are referring to the reflex angle. |
In the figure below, the green arrow indicates the reflex angle.
