1. Types of Angles

2. Four Types of Angles
• In geometry, there are four different types of
angles that measure 180: or less.
• The four types of angles are
acute, right, obtuse, or straight.
• Measuring an angle using a protractor can
help you determine if the angle is an
acute, right, obtuse, or straight angle.

3. Acute Angle
• An acute angle is an angle that measures
greater than 0: (degrees) and less than 90:.

4. Right Angle
• A right angle is an angle formed by two
perpendicular lines. It measures exactly 90:.

5. Obtuse angle
• An obtuse angle is an angle that measures
greater than 90: and less than 180:.

6. Straight angle
• A straight angle is an angle that measures
exactly 180:.

7. More examples