geometry theorem 3-7 through 3-9
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theorem 3-9
if a line is congruent to one of two parallel lines passing through it then it is congruent to the other parallel line
theorem 3-8
if two lines are congruent to the same line then they are parallel to each other
theorem 3-7
if two lines are parallel to the same line then they are parallel to each other
vertical, alternate interior, alternate exterior, or corresponding
=
linear pair or same side interior
=180
converse
proves lines are parallel
