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G.CO.9 Vertical Angles: Quick Exploration

Author:Cindy Almazan, Anthony OR 柯志明, GeoGebra Classroom Activities, Tim Brzezinski

Use the protractor to measure angles 1 and 2 below.

What did you get for the measure of ? How about ?

Use the slider to change the sizes of angles 1 and 2. Use the protractor to measure them both again.

and are said to be vertical angles. From your observations, what seems to be true?

Describe how you can tell whether two angles are vertical? What is true about the angle measures? Use transformations to explain your reasoning.

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