Alternate Interior Angles: Quick Investigation

The directions for this activity can be found below the applet.
If you haven't done so yet, drag the [color=#ff7700][b]orange point[/b][/color] along transversal [i]n[/i] as far as it will go. [br][br] Stop when the [color=#ff00ff][b]pink point [/b][/color]appears & answer the following question: [br][br][b][color=#0000ff][size=150]What type of angles are a & a[sub]2[/sub]?[/size][/color][/b]
[b][size=150][color=#0000ff]Why are angle a[sub]1 [/sub]and a[sub]1[/sub] congruent?[/color][/size][/b]
[center][b][color=#ff0000]Great job! Now return to teams![/color][/b][/center]
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Information: Alternate Interior Angles: Quick Investigation