Transversal and Parallel Lines Activity
Click on the check boxes to show the angles on the diagram.

1. Drag the point C across the line g, what observations do you notice about the angle sizes?
2. As you drag C across the line g, what conjecture can you make about the alternate interior angles (< 5 and <7)?
3. Now take the measure of < 5 and < 7, was your conjecture true? Why do you think this happens?
4. As you drag C across g, what conjecture can you make about the alternate exterior angles (< 3 and < 4)?
5. Now again take the measure of < 3 and < 4, was your conjecture true? Why do you think this happens?
6. How are angles 2 and 5 and angles 4 and 7 related?
7. Drag C, what conjecture can you make about consecutive interior angles? Was it correct?
8. Why do you think the observations you noticed are true? (Hint: how do these angles relate to each other.)
9. Lastly drag the point such that it makes h is perpendicular to both g. Using what you have learned, is h also perpendicular to e? How do you know?