Alternate Interior Angles -- When are they congruent?

1. Are the angles congruent? 2. Drag the point to see what changes. 3. You can use checkboxes [b]Compare Angles[/b] and [b]Compare Lines[/b] to get more information. 4. Play [b]The Congruent Game[/b]! What's your top score? 5. Make a conjecture... when are the angles congruent? 6. Are there other conjectures we could make about other lines or other angles in this picture?

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