# Lesson 2.6 Vertical Angles Congruence Theorem

- Author:
- Sandra Cane, Tim Brzezinski

- Topic:
- Angles, Congruence

Use the applet below to answer the questions that appear beneath it.

Use the **Angle** tool to measure each **yellow angle**. What do you notice?

Click the other checkbox to show the **other pair of vertical angles**.
Use the angle tool to measure these **two green vertical angles **now.
What do you notice?

Now that you have all four angle measures displayed, drag the slider around. What can you conclude about each pair of vertical angles?