Vertical Angles: Quick Exploration
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?
![Image](https://www.geogebra.org/resource/f3we7bt6/kQBa0Dcpa6Ozx54G/material-f3we7bt6.png)
![Image](https://www.geogebra.org/resource/eqdgfafe/0FCEY7NWpxbpnEEP/material-eqdgfafe.png)