Notes 3-4

Quiz
Transversal and corres. angles ws

3.4 Proving lines are Parallel
How can you prove 2 lines are ||?????????? All the theorems we learned yesterday are useless if you cannot prove that the lines are || to begin with. Here’s how you do it:
If a transversal cuts 2 lines and the ____________________ . then the lines are ||
Postulate 16 Corresponding angles Converse- corresponding angles are congruent
Theorem 3.8 Alternate Interior (AI) Converse- AI angles are congruent
Theorem 3.9 Consecutive Interior (CI) Converse- CI angles are supplementary
Theorem 3.10 Alternate Exterior (AE) Converse- AE angles are congruent

Ex 1-3. proving about theorems
Try pg 155 # 30 then practice 153 1-9

Ws 3-4