1. Classify Angles
Section 7.1

2. Vocabulary
An angle is formed by two __________ that share a common ____________.
The ____________ is the point where the two rays meet.

4. Notes: Name and Identify Angles
Two angles are ___________ if they are opposite angles formed by the intersection of wo lines.
Vertical angles are ___________ or have the same measure.
Two angles are ______________ if they share a common vertex, a common side, and do not overlap.
You can name an angle by its vertex and its points.

5. Notes: Key Concept

6. Example
Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

7. Example
Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

8. Example
Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

9. Notes: Find a Missing Measure
You can use what you learned about vertical and adjacent angles to find the value of a missing measure.

10. Example
What is the value of x in the figure?

11. Example
What is the value of y?

14. Critical Thinking
Identify a pair of vertical angles and adjacent angles on the railroad crossing sign. Justify your response.

15. Essential Question
Describe the differences between vertical and adjacent angles.
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