Parallel Lines and Transversals Section 3-1.  2 lines that do not intersect are either parallel or skew.  Parallel lines ( lines) do not intersect and.

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Presentation transcript:

Parallel Lines and Transversals Section 3-1

 2 lines that do not intersect are either parallel or skew.  Parallel lines ( lines) do not intersect and are coplanar.  Skew lines do not intersect and are not coplanar.

 Parallel planes ( planes) do not intersect. Plane X is parallel to plane Y  A line and a plane are parallel if they do not intersect. X Y H G D E A B C F plane Y

 A transversal is a line that intersects 2 or more coplanar lines in different points transversal interior exterior

 Alternate interior angles are 2 nonadjacent interior angles on opposite sides of the transversal

 Consecutive interior angles are 2 interior angles on the same side of the transversal

 Alternate exterior angles are 2 nonadjacent exterior angles on opposite sides of the transversal

 Consecutive exterior angles are 2 exterior angles on the same side of the transversal

 Corresponding angles are 2 angles in corresponding positions relative to the 2 lines

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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