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Geometry Notes Sections 3 - 5 What you’ll learn . . . How to recognize angle conditions that occur with parallel lines. How to prove that two line are parallel based on given angle relationships. Vocabulary No vocabulary =) Postulate If corresponding angles are congruent, then the lines are parallel. If 1 5, 2 6, 3 6, or 4 8, then line m n . If alternate interior angles are ______________, do you think the lines are parallel? If alternate exterior angles are _____________, do you think the lines are parallel? If consecutive interior angles are _____________, do you think the lines are parallel? If two lines are perpendicular to the same line, do you think they have to be parallel? This is called the “Perpendicular Transversal Theorem Have you learned….. How to recognize angle conditions that occur with parallel lines? How to prove that two line are parallel based on given angle relationships?