Vertical Angles Exploration (2)

Interact with this app below for a minute. Then answer the questions that follow.
Use the ANGLE tool to measure a pair of colored angles. What do you notice?
Measure the other two angles you see 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?
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Information: Vertical Angles Exploration (2)