 Lesson 1: Parallel Lines and Transversals

 Parallel lines ( || )- coplanar lines that do not intersect (arrows on lines indicate which sets are parallel to each other)  Parallel planes- two or more planes that do not intersect  Skew lines- lines that do not intersect but are not parallel (are not coplanar)  Transversal- a line that intersects two or more lines in a plane at different points

 Exterior angles: outside the two parallel lines  Interior angles: between the two parallel lines  Consecutive Interior angles: between the two parallel lines, on the same side of the transversal  Consecutive Exterior angles: outside the two parallel lines, on the same side of the transversal  Alternate Exterior angles: outside the two parallel lines, on different sides of the transversal  Alternate Interior angles: between the two parallel lines, on different sides of the transversal  Corresponding angles: one outside the parallel lines, one inside the parallel lines and both on the same side of the transversal

A. Name all segments parallel to BC. B. Name a segment skew to EH. C. Name a plane parallel to plane ABG.

A. 2 and 6 B. 1 and 7 C. 3 and 8 D. 3 and 5

A. Identify the sets of lines to which line a is a transversal. B. Identify the sets of lines to which line b is a transversal. C. Identify the sets of lines to which line c is a transversal.