3-1 Properties of Parallel Lines

# 3-1 Properties of Parallel Lines - Corresponding Angles...

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Properties of Parallel Lines Section 3-1

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A transversal is a line that intersects 2 or more coplanar lines in different points. 1 2 3 4 5 6 7 8 transversal interior exterior exterior
3 6 and 4 5 and Alternate interior angles are 2 nonadjacent interior angles on opposite sides of the transversal. 1 2 3 4 5 6 7 8 4 5 and

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3 5 and 3 5 and Same-side interior angles are 2 interior angles on the same side of the transversal. 1 2 3 4 5 6 7 8 4 6 and
Alternate exterior angles are 2 nonadjacent exterior angles on opposite sides of the transversal. 1 2 3 4 5 6 7 8 1 8 and 2 7 and

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Consecutive exterior angles are 2 exterior angles on the same side of the transversal. 1 2 3 4 5 6 7 8 1 7 and 2 8 and
Corresponding angles are 2 angles in corresponding positions relative to the 2 lines. 1 2 3 4 5 6 7 8 1 5 and 2 6 and 3 7 and 4 8 and

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Corresponding Angles Postulate

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Unformatted text preview: Corresponding Angles Postulate (Postulate 3-1) (Postulate 3-1) If 2 parallel lines are cut by a transversal, then corresponding angles are congruent. 1 2 3 4 5 6 7 8 8 4 7 3 6 2 5 1 2245 2245 2245 2245 Alternate Interior Angles Theorem (Thm 3-1) If a transversal intersects two parallel lines, then alternate interior angles are congruent. 80 80 100 100 Same-Side Interior Angles Theorem (Thm 3-2) If a transversal intersects two parallel lines, then same-side interior angles are supplementary. 120 120 60 60 Joke Time What did E.T.s Mom say when he got home? Where on Earth have you been? What happened when the pig pen broke? The pigs had to use a pencil....
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3-1 Properties of Parallel Lines - Corresponding Angles...

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