Question 1003663
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<B>Theorem &nbsp;<I>(Parallel transversal theorem)</I></B>
If two lines are parallel and are intersected by a transversal &nbsp;then:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b) &nbsp;alternate interior angles are congruent;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) &nbsp;alternate exterior angles are congruent.


See the lesson &nbsp;<A HREF=http://www.algebra.com/algebra/homework/Angles/Parallel-lines.lesson?content_action=edit_dev>Parallel lines</A>&nbsp; in this site.