This document discusses different types of angles and their degree measurements. It defines acute angles as between 0 and 90 degrees, obtuse angles as between 90 and 180 degrees, right angles as 90 degrees, and a straight angle as 180 degrees. Examples of each type of angle are provided.

1. A N G L E S

2. You will learn to classify angles as acute , obtuse , right , or straight .

3. Here are some examples of angles .

4. Angle Measurements We measure the size of an angle using degrees . Here are some examples of angles and their degree measurements.

5. Acute Angles An acute angle is an angle measuring between 0 and 90 degrees. The following angles are all acute angles.

6. Obtuse Angles An obtuse angle is an angle measuring between 90 and 180 degrees. The following angles are all obtuse.

7. Right Angles A right angle is an angle measuring 90 degrees. The following angles are both right angles.

8. Straight Angle A straight angle is 180 degrees.