Objective
To determine whether two lines are parallel
In the Solve It, you used parallel lines to find congruent and supplementary relationships of special angle pairs. In this lesson you will do the converse. You will use the congruent and supplementary relationships of the special angle pairs to prove lines parallel.
Essential Understanding You can use certain angle pairs to decide whether two lines are parallel.
Postulate
If two lines and a transversal form corresponding angles that are congruent, then the lines are parallel.
If …
Then …