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Geometry 3-1 Parallel Lines and Transversals A line that intersects two or more coplanar lines at two different points is called a transversal . In the diagram, line p is a transversal. Angles 1, 2, 7, and 8 are interior angles. q Angles 3, 4, 5, and 6 are exterior angles. 4 3 Coplanar lines that do not intersect are called parallel lines. Noncoplanar lines that do not intersect are called skew lines. Planes that do not intersect are parallel planes. H Q Identify two pairs of parallel segments. HQ and PE; PR and EG P Identify two pairs of skew segments. FR and PE; EG and HP F R S G Identify the transversal for each pair of angles, and classify the relationship between the angles. 4 13 2 and 3 n 12 7 1 5 Transversal q; 14 11 m alternate interior 92 8 16 p 6 10 3 15 q 1 2 E 5 and 10 Transversal n; corresponding 8 7 6 5 p Angles 1,7 are alternate interior angles. r Angles 3,5 are alternate exterior angles. Angles 2,7 are consecutive interior angles. Angles 3,6 are consecutive exterior angles. Angles 3,8 are corresponding angles.

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