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Parallel Lines Cut by a Transversal & Angle Relationships!

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Proving Lines are Perpendicular by Shmoop

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To prove lines are perpendicular, both bisected angles must equal each other and equal 90 degrees. If both of these are true, then the lines are perpendicular. Perpendicular Lines: http://www.shmoop.com/parallel-perpendicular-lines/perpendicular-lines.html

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To prove lines are parallel you need a third line called a transversal. A transversal will create 8 different angles in which corresponding angles are identical. If two lines are cut by a transversal and the corresponding angles are congruent then the lines are parallel. Parallel Lines: http://www.shmoop.com/parallel-perpendicular-lines/parallel-lines.html

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Ch 3

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Unit 3 - Equations of Lines, Parallel Lines (Ch 3) - Geometry CP1

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Please let us know if any of the links below aren't working by emailing your teacher. Thank you!

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Ch 3

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Parallel & Perpendicular Lines