What are equal and parallel line?
If two parallel lines are cut by a transverse, the alternate angles are equal.
and 
These are two pairs of alternate angles.
A transversal intersects two lines. If the alternate angles are equal, then the lines are parallel.
If
or 
then AB is parallel to CD.
If two parallel lines are cut by a transverse, the alternate angles are equal. and These are two pairs of alternate angles.
A transversal intersects two lines. If the alternate angles are equal, then the lines are parallel.
If
or then AB is parallel to CD.
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