## Types of Angles

## Formative Assessment

# Summary of the Math: Types of Angles

**Read and Discuss**

*Supplementary angles*are two angles with measures that add up to 180°. Two supplementary angles together form a straight angle.- In Figure 2, ∠
*c*and ∠*d*are supplementary angles.

- In Figure 2, ∠
*Complementary angles*are angles with measures that add up to 90°. Two complementary angles together form a right angle.- In Figure 1, ∠
*x*and ∠*y*are*complementary angles.*

- In Figure 1, ∠
- Two intersecting lines create four angles. Each pair of equal angles are vertically opposite angles or
*vertical angles*.- In Figure 2, ∠
*a*and ∠*c*are*vertical angles.*

- In Figure 2, ∠
*Adjacent angles*are angles that are next to each other; they share a vertex and a side.- In Figure 2, ∠
*a*and ∠*d*are*adjacent angles.*

- In Figure 2, ∠

## Hint:

Can you:

- Explain when adjacent angles are supplementary?
- Explain what is true of vertical angles?
- Describe the angle formed by two angles that are complementary and adjacent?