Please help with geometry
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Please help with geometry

[From: ] [author: ] [Date: 13-02-16] [Hit: ]
......
What is a valid reason for stating that: <1 = <2?
Diagram:
http://oi49.tinypic.com/2nuio95.jpg

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It is simply a rule in geometry:
if two lines being crossed are parallel then the opposite interior angles are equal

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Alternate interior angles are equal, sometimes called the rule of Z's.

Visualize a backwards Z
1
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