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GeoGebraGeoGebra Classroom

Vertical Angles and Linear Pairs

This applet demonstrates Vertical Angles and Linear Pair relationships.

Use the above applet to answer the following questions. You must answer these questions on a separate sheet of binder paper that will be stamped when you complete the investigation.

  1. Check each of the boxes labeled 1 and 2 under Vertical Angles. Where are vertical angles located? What do you observe about the angle measures of these vertical angles?
  2. Check each of the boxes labeled 3, 4, 5, and 6 under Linear Pairs. What do you observe about the measures of each pair of angles that form a linear pair?
  3. Click and drag the blue points to change the angle measures. Do the angle relationships change?
  4. Complete the following conjectures: If two angles are vertical angles, then ____________________. If two angles form a linear pair, then _____________________.