1. Geometry Notes
Sections 3 - 5 

2. 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. 

3. Vocabulary
No vocabulary =) 

4. 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 . 

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6. If alternate interior angles are ______________, do you think the lines are parallel?

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8. If alternate exterior angles are _____________, do you think the lines are parallel?

9. If consecutive interior angles are _____________, do you think the lines are parallel?

10. If two lines are perpendicular to the same line, do you think they have to be parallel?
This is called the “Perpendicular Transversal Theorem 

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20. 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? 