3-8 Slopes of Parallel and Perpendicular Lines

Objective

To relate slope to parallel and perpendicular lines

A Solve It problem demonstrates slopes of parallel lines.
Image Long Description

In the Solve It, slope represents the running rate, or speed. According to the graph, you and your friend run at the same speed, so the slopes of the lines are the same. In this lesson, you will learn how to use slopes to determine how two lines relate graphically to each other.

Essential Understanding You can determine whether two lines are parallel or perpendicular by comparing their slopes.

When two lines are parallel, their slopes are the same.


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Table of Contents

Prentice Hall Geometry Chapter 1 Tools of Geometry Chapter 2 Reasoning and Proof Chapter 3 Parallel and Perpendicular Lines Chapter 4 Congruent Triangles Chapter 5 Relationships Within Triangles Chapter 6 Polygons and Quadrilaterals Chapter 7 Similarity Chapter 8 Right Triangles and Trigonometry Chapter 9 Transformations Chapter 10 Area Chapter 11 Surface Area and Volume Chapter 12 Circles Skills Handbook Reference Visual Glossary Selected Answers Index Acknowledgments