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andand Angles 3-1 Lines Angles 3-1 Lines Warm Up Lesson Presentation Lesson Quiz Holt Geometry 3-1 Lines and Angles Warm Up Identify each of the following. 1. points that lie in the same plane coplanar points 2. two angles whose sum is 180° supplementary angles 3. the intersection of two distinct intersecting lines point 4. a pair of adjacent angles whose non-common sides are opposite rays linear pair Holt Geometry 3-1 Lines and Angles Objectives Identify parallel, perpendicular, and skew lines. Identify the angles formed by two lines and a transversal. Holt Geometry 3-1 Lines and Angles Vocabulary parallel lines perpendicular lines skew lines parallel planes transversal corresponding angles alternate interior angles alternate exterior angles same-side interior angles Holt Geometry 3-1 Lines and Angles Holt Geometry 3-1 Lines and Angles Helpful Hint Segments or rays are parallel, perpendicular, or skew if the lines that contain them are parallel, perpendicular, or skew. Holt Geometry 3-1 Lines and Angles Example 1: Identifying Types of Lines and Planes Identify each of the following. A. a pair of parallel segments LM ||QR B. a pair of skew segments KN and PQ C. a pair of perpendicular segments NS ⊥ SP D. a pair of parallel planes plane NMR || plane KLQ Holt Geometry 3-1 Lines and Angles Check It Out! Example 1 Identify each of the following. a. a pair of parallel segments BF || EJ b. a pair of skew segments BF and DE are skew. c. a pair of perpendicular segments BF ⊥ FJ d. a pair of parallel planes plane FJH || plane BCD Holt Geometry 3-1 Lines and Angles Holt Geometry 3-1 Lines and Angles Example 2: Classifying Pairs of Angles Give an example of each angle pair. A. corresponding angles ∠1 and ∠5 B. alternate interior angles ∠3 and ∠5 C. alternate exterior angles ∠1 and ∠7 D. same-side interior angles ∠3 and ∠6 Holt Geometry 3-1 Lines and Angles Check It Out! Example 2 Give an example of each angle pair. A. corresponding angles ∠1 and ∠3 B. alternate interior angles ∠2 and ∠7 C. alternate exterior angles ∠1 and ∠8 D. same-side interior angles ∠2 and ∠3 Holt Geometry 3-1 Lines and Angles Helpful Hint To determine which line is the transversal for a given angle pair, locate the line that connects the vertices. Holt Geometry 3-1 Lines and Angles Example 3: Identifying Angle Pairs and Transversals Identify the transversal and classify each angle pair. A. ∠1 and ∠3 transversal l corr. ∠s B. ∠2 and ∠6 transversal n alt. int ∠s C. ∠4 and ∠6 transversal m alt. ext ∠s Holt Geometry 3-1 Lines and Angles Check It Out! Example 3 Identify the transversal and classify the angle pair ∠2 and ∠5 in the diagram. transversal n same-side int. ∠s. Holt Geometry 3-1 Lines and Angles Lesson Quiz: Part I Identify each of the following. 1. a pair of parallel segments EH || FG 2. a pair of skew segments BF and EH 3. a pair of perpendicular segments CG ⊥ GH 4. a pair of parallel planes ABC and EFG Holt Geometry 3-1 Lines and Angles Lesson Quiz: Part II Identify each of the following. 5. one pair alternate interior angles ∠EHG and ∠HGK 6. One pair corresponding angles ∠EHG and ∠FGJ 7. one pair alternate exterior angles ∠IHE and ∠JGK 8. one pair same-side interior angles ∠EHG and ∠HGF Holt Geometry