Table of Contents
                                         Lines and Angles                                                                                              2
                                         Chapter                          Points, Lines, Planes, and Angles                                            4
                                                                          1-1     Points, Lines, and Planes..................................................6
                                                                          1-2     Linear Measure and Precision.......................................13
                                                                                  Practice Quiz 1: Lessons 1-1 and 1-2............................19
                       • Introduction 3                                           Geometry Activity: Probability and 
                       •Follow-Ups 23, 65, 155                                       Segment Measure........................................................20
                       • Culmination 164                                  1-3     Distance and Midpoints.................................................21
                                                                                  Geometry Activity: Modeling the 
                                                                                     Pythagorean Theorem.................................................28
                                                                          1-4     Angle Measure.................................................................29
                                                                                  Practice Quiz 2: Lessons 1-3 and 1-4............................36
                                                                          1-5     Angle Relationships........................................................37
                                                                                  Geometry Activity: Constructing Perpendiculars .....44
                                                                          1-6     Polygons............................................................................45
                                                                                  Geometry Software Investigation:
                                                                                     Measuring Polygons...................................................51
                                                                                  Study Guide and Review..............................................53
                                                                                  Practice Test.....................................................................57
                                                                                  Standardized Test Practice...........................................58
                                                                         Lesson 1-5, p. 37
                      Prerequisite Skills                                               Standardized Test Practice   
                      • Getting Started 5                                               • Multiple Choice 11, 19, 23, 25, 27, 35, 43, 50, 57, 58
                      • Getting Ready for the Next Lesson 11, 19, 27, 36, 43            • Short Response/Grid In 43, 50, 59
                                                                                        • Extended Response 59
                                         Study Organizer 5
                                                                                                    Snapshots 16
                      Reading and Writing Mathematics   
                      • Describing What You See 12                                      Constructions 15,18,24,31,33,44
                      • Reading Math Tips 6, 29, 45, 46
                      •Writing in Math 11, 19, 27, 35, 43, 50
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                                                                                                                                              Jason Hawkes/CORBIS 
          Unit 1
          Unit 1
                                 Chapter                         Reasoning and Proof                                                      60
                                                                 2-1    Inductive Reasoning and Conjecture...........................62
             Prerequisite Skills                                 2-2    Logic..................................................................................67
             • Getting Started  61                               2-3    Conditional Statements..................................................75
             • Getting Ready for the Next Lesson                        Practice Quiz 1: Lessons 2-1 through 2-3....................80
               66, 74, 80, 87, 93, 100, 106                      2-4    Deductive Reasoning......................................................82
                                                                        Geometry Activity: Matrix Logic..................................88
                                                                 2-5    Postulates and Paragraph Proofs..................................89
             Study Organizer 61                                  2-6    Algebraic Proof................................................................94
                                                                        Practice Quiz 2: Lessons 2-4 through 2-6..................100
             Reading and Writing                                 2-7    Proving Segment Relationships..................................101
             Mathematics   
             • Biconditional Statements 81                       2-8    Proving Angle Relationships.......................................107
             • Reading Math Tips 75                                     Study Guide and Review............................................115
             •Writing in Math 66, 74, 79, 86, 93,                       Practice Test..................................................................121
                                99, 106, 114                            Standardized Test Practice........................................122
             Standardized Test Practice   
             • Multiple Choice 66, 74, 80, 86, 87,
               93, 96, 97, 99, 106, 114, 121, 122
             • Short Response/Grid In 106, 123
             • Extended Response 123
                                                                 Lesson 2-3, p. 79
                         Snapshots 63
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          Galen Rowell/CORBIS 
                                                                                                                                          Unit 1
                                                                                                                                           Unit 1
                                         Chapter                          Parallel and Perpendicular 
                                                                          Lines                                                                   124
                                                                          3-1    Parallel Lines and Transversals...................................126
                                                                                 Geometry Software Investigation: 
                                                                                    Angles and Parallel Lines........................................132
                                                                          3-2    Angles and Parallel Lines............................................133
                                                                                 Practice Quiz 1: Lessons 3-1 and 3-2 .........................138
                                                                          3-3    Slopes of Lines...............................................................139
                                                                          3-4    Equations of Lines.........................................................145
                                                                                 Practice Quiz 2: Lessons 3-3 and 3-4 .........................150
                                                                          3-5    Proving Lines Parallel...................................................151
                                                                                 Graphing Calculator Investigation: 
                                                                                    Points of Intersection................................................158
                                                                          3-6    Perpendiculars and Distance.......................................159
                                                                                 Geometry Activity: Non-Euclidean Geometry.........165
                                                                                 Study Guide and Review............................................167
                                                                                 Practice Test..................................................................171
                                                                                 Standardized Test Practice........................................172
                                                                          Lesson 3-6, p. 163
                      Prerequisite Skills                                               Standardized Test Practice
                      • Getting Started  125                                            • Multiple Choice 131, 138, 144, 149, 157, 164, 171, 172
                      • Getting Ready for the Next Lesson  131, 138, 144,               • Short Response/Grid In 131, 135, 136, 164, 173
                                                           150, 157                     • Extended Response 173
                                         Study Organizer 125                                        Snapshots 143
                      Reading and Writing Mathematics                                   Constructions 151,160
                      •Writing in Math 130, 138, 144, 149, 157, 164
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                                                                                                                               Lonnie Duka/Index Stock Imagery/PictureQuest 
                               Triangles                                                                                              174
                                Chapter                        Congruent Triangles                                                     176
                                                               4-1     Classifying Triangles.....................................................178
                                                                       Geometry Activity:Angles of Triangles....................184
                                                               4-2     Angles of Triangles .......................................................185
              • Introduction 175                               4-3     Congruent Triangles.....................................................192
              •Follow-Ups 218, 241, 325, 347                           Practice Quiz 1: Lessons 4-1 through 4-3..................198
              • Culmination 390                                4-4     Proving Congruence—SSS, SAS.................................200
                                                               4-5     Proving Congruence—ASA, AAS...............................207
                                                                       Geometry Activity: Congruence in 
                                                                          Right Triangles...........................................................214
                                                               4-6     Isosceles Triangles.........................................................216
                                                                       Practice Quiz 2: Lessons 4-4 through 4-6..................221
                                                               4-7     Triangles and Coordinate Proof .................................222
                                                                       Study Guide and Review............................................227
                                                                       Practice Test..................................................................231
                                                                       Standardized Test Practice........................................232
                                                                       Lesson 4-4, p. 204
              Prerequisite Skills                                             Standardized Test Practice   
              • Getting Started  177                                          • Multiple Choice 183, 191, 198, 206, 213, 217, 219,
              • Getting Ready for the Next Lesson  183, 191, 198, 206,                          221, 226, 231, 232
                                                  213, 221                    • Short Response/Grid In 233
                                                                              • Extended Response 233
                                Study Organizer 177
                                                                                         Snapshots 206
              Reading and Writing Mathematics   
              • Making Concept Maps 199                                       Constructions 200,202,207,214
              • Reading Math Tips 186, 207
              •Writing in Math 183, 191, 198, 205, 213, 221, 226
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          Elaine Thompson/AP/Wide World Photos