Classify each pair of lines as parallel, perpendicular, or neither. If they are parallel or perpendicular, use the appropriate notation. a) m n b) A C D B c) J W K X Solution a) Lines m and n meet at right angles, so they are perpendicular. Write m n. · · b) Lines AB and CD intersect but not at right angles. They are neither parallel nor perpendicular. · c) Lines JK · and WX · do not intersect, so they are parallel. Write JK · 7 WX . EXAMPLE 4 YOU TRY 4 Classify each pair of lines as parallel, perpendicular, or neither. If they are parallel or perpendicular, use the appropriate notation. a) t v b) c d c) A F G B Note Even if two lines or rays look like they intersect at right angles, we cannot assume they are right angles unless the angle is denoted with the square. is a right angle may not be a right angle ANSWERS TO YOU TRY EXERCISES ¡ 1) a) line segment; CD or DC b) ray; HG · c) line; MN · or NM 2) 1: RPM or MPR; 2: MPQ or QPM; 3: QPN or NPQ; 4: RPN or NPR 3) a) right b) acute c) straight d) obtuse · · 4) a) neither b) c 7 d c) AB FG 290 CHAPTER 4 Basic Geometry Concepts and Algebra www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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