Recognize relationships between angles that are interior to parallel lines.

1) Move the slider left and right. What does the slider manipulate? What do you notice when you move the slider?
2) What is the relationship between \alpha and \delta? What is the relationship between \gamma and \beta?
3) What is the relationship between \alpha and \gamma? What is the relationship between \delta and \beta?
4) What is the relationship between \alpha and \beta? What is the relationship between \delta and \gamma
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