Classifying Angles

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

**Acute angles** have
measures that are greater than **0°** 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°**.