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# Supplementary, Complementary, and Vertical Angles

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#### Vertical angles are opposite to each other.

Example: What is the measure of angle a?

a + 50° = 90° (complementary angles)

a = 90° – 50° = 40°

Example: What is the value of x?

57 = 6x + 3 (Vertical angles)

6x = 57 – 3

6x = 54 implies x = 9

## Check Point

1. Find the measure of angle b.

2. What is the measure of angle x?

3. What is the measure of angle y?

4. Find the value of x.

5. What is the value of x?

1. 66°
2. 82°
3. 82°
4. 14
5. 24

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