Step 1: Draw PQ and place point R between P and Q. Choose another point S not on line PQ and draw RS. You have just constructed line segment PR. Place the "zero edge" of your protractor along PQ. What do you notice about the sum of the measures of the linear pair of angles? (Your drawing should look similar to the example below)
Step 2: Complete the sentence below based on your observations above:
If two angles form a linear pair, then...
Step 3: Draw intersecting lines and label the angles one through four. Which angles are vertical angles?
(Your drawing should look similar to the example in the right)
Step 4: Measure the parts of vertical angles.
Protractor
Complete: Write the sentence below based on your observations above:
If two angles are vertical angles, then...
If (x) is a degree of a vertical angle, then...