Vertical and Linear Angle Pairs

When two lines intersect, the angles that are opposite each other are called vertical angles. A linear angle pair is a pair of adjacent angles whose non-common sides are opposite rays. INSTRUCTIONS FOR TASK: Drag point A, B, C, or D to change the slope of the lines and observe the measures of the vertical angles. NOTE: Don't Click on the Check Boxes in the Applet Screen Until You have made Your Conjecture in #2.

1.

Which of the following angle pairs are vertical angles: (check all that apply)

Check all that apply

2.

What do you think is true about the relationship between vertical angles? (Once You have made your guess you can click on the check boxes in the applet window to see if you were right.)

3.

Which of the following angle pairs are linear angle pairs: (check all that apply)

Check all that apply