Translator’s Preface ix
Author’s Prefaces xi
Preface to the Second Edition xi
Preface to the Eighth Edition xii
Preface to the Twelfth Edition xii
Preface to the First Edition xii
Introduction 1
Book I
On the Straight Line 7
Chapter I. On Angles 9
Exercises 18
Chapter II. On Triangles 21
Exercises 29
Chapter III. Perpendiculars and Oblique Line Segments 31
Exercises 33
Chapter IV. Cases of Congruence for Right Triangles.
A Property of the Bisector of an Angle 35
Exercises 37
Chapter V. Parallel Lines 39
Exercises 44
Chapter VI. On Parallelograms. On Translations 45
Exercises 51
Chapter VII. Congruent Lines in a Triangle 53
Exercises 56
Problems for Book 1 57
Book II
On the Circle 59
Chapter I. Intersection of a Line with a Circle 61
Exercises 64
Chapter II. Diameters and Chords 65
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