## LESSON: Classifying Angles

### Objectives/Vocab

## Objectives

- Classify angles as acute, right, obtuse or straight.
- Classify angle pairs as supplementary or complementary
- Use real-world angle pair diagrams to find unknown angle measures.

## Vocabulary

- Acute angle
- an angle less than 90 degrees.

- Right angle
- an angle equal to 90 degrees.

- Obtuse angle
- an angle greater than 90 degrees but less than 180 degrees.

- Straight angle
- a straight line equal to 180 degrees

- Supplementary angles
- two angles whose sum is 180 degrees.

- Complementary angles
- two angles whose sum is 90 degrees