2.2: Vertical and Adjacent Angles
This activity is intended to supplement Geometry, Chapter 1, Lesson 5.
Problem 1 – Exploring Vertical Angles
1. Define Vertical (or Opposite) Angles.
2. Open the Cabri Jr. file VERTICAL.
Name two pairs of vertical angles.
3. Move point
Location 












What patterns do you notice?
4. If
5. If
6. Based on your data from Question 3, make a conjecture about vertical angles in general.
Problem 2 – Exploring Adjacent Angles
7. Define Adjacent Angles.
8. Use the file VERTICAL from Problem 1. Identify all four pair of adjacent angles.
9. Move point
10. If
Complete the following problems.
11. Find the value of
12. Find the value of
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