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Classifying Angles


There are three types of angles. They are classified by their measures.


Acute angles have measures that are greater than and less than 90°.


Right angles have measures of exactly 90°.



The red square in the corner of the angle is the symbol used to indicate a right angle.



Obtuse angles have measures that are greater than 90° and less than 180°.






Straight angles have measures of exactly 180°.