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Unformatted text preview: one of 2 parallel lines, then it is perpendicular to the other one also. Theorem • 2 lines parallel to a 3 rd line are parallel to each other. Ways to Prove 2 Lines Parallel 1. Show that a pair of corresponding angles are congruent. 2. Show that a pair of alternate interior angles are congruent. 3. Show that a pair of sameside interior angles are supplementary. 5. In a plane, show that both lines are perpendicular to a 3 rd line. 6. Show that both lines are parallel to a 3 rd line. Joke Time How do you know when it’s raining cats and dogs? When you step in a poodle! Why did the apple go out with a fig? Because it couldn’t find a date...
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 Fall '10
 Towns
 Geometry, Angles

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