| Modern Elementary Geometry | |
| The Beginnings of Geometry | p. 1 |
| Directed segments and angles | p. 4 |
| Ideal points and ratios | p. 9 |
| The theorem of Menelaus | p. 12 |
| Ceva's theorem | p. 19 |
| Some geometry of the triangle | p. 25 |
| More geometry of the triangle | p. 33 |
| Geometric constructions | p. 40 |
| Isometries in the Plane | |
| The Amazing Greeks | p. 48 |
| Introduction to translations, rotations, and reflections | p. 50 |
| Introduction to isometries | p. 55 |
| Transformation theory | p. 59 |
| Isometries as products of reflections | p. 63 |
| Translations and rotations | p. 68 |
| Halfturns | p. 72 |
| Products of reflections | p. 74 |
| Properties of isometries; a summary | p. 77 |
| Applications of isometries to elementary geometry | p. 79 |
| Further elementary applications | p. 83 |
| Advanced applications | p. 87 |
| Analytic representations of direct isometries | p. 93 |
| Analytic representations of opposite isometries | p. 97 |
| Similarities in the Plane | |
| The rebirth of mathematical thinking | p. 101 |
| Introduction to similarities | p. 104 |
| Homothety | p. 106 |
| Similarity | p. 110 |
| Applications of similarities to elementary geometry | p. 114 |
| Further elementary applications | p. 119 |
| Advanced applications | p. 124 |
| Analytic representations of similarities | p. 128 |
| Vectors and Complex Numbers in Geometry | |
| The search for the meaning of complex numbers | p. 131 |
| Introduction to complex numbers | p. 134 |
| Vectors | p. 138 |
| Vector multiplication | p. 143 |
| Vectors and complex numbers | p. 150 |
| Triangles in the Gauss plane | p. 155 |
| Lines in the Gauss plane | p. 161 |
| The circle | p. 165 |
| Isometries and similarities in the Gauss plane | p. 168 |
| Inversion | |
| Matchless modern mathematics | p. 171 |
| Inversion | p. 175 |
| Progressions, ratios, and Peaucellier's cell | p. 180 |
| Inversion and complex geometry | p. 185 |
| Applications of inversion | p. 189 |
| Isometries in Space | |
| What next? | p. 196 |
| Introduction to three dimensions | p. 201 |
| Reflection in a plane | p. 204 |
| Basic space isometries | p. 208 |
| More space isometries | p. 211 |
| Some applications | p. 218 |
| Analytic representations | p. 222 |
| Appendixes | |
| A Summary of Book I of Euclid's Elements | p. 226 |
| Basic Ruler and Compass Constructions | p. 228 |
| Bibliography | p. 232 |
| Hints for Selected Exercises | p. 235 |
| Answers | p. 248 |
| Index | p. 288 |
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