Library

Introduction
Volume 4
- IliadHomer
- The OdysseyHomer
Volume 5
Volume 6
- History of the Peloponnesian WarThucydides
- The HistoryHerodotus
Volume 7
Volume 8
- On the SoulAristotle
- PhysicsAristotle
Volume 9
Volume 10
- Hippocratic WritingsHippocrates
- On the Natural FacultiesGalen
Volume 11
- ElementsEuclid
Volume 12
Volume 13
- The AeneidVirgil
- Works and Days & TheogonyHesiod
Volume 14
- LivesPlutarch
Volume 15
Volume 17
- Sixth EnneadPlotinus
- Third EnneadPlotinus
Volume 18
- ConfessionsAugustine
- The City of GodAugustine
Volume 19
- Summa Theologica, Part IAquinas
Volume 21
- Divine ComedyDante
Volume 22
- Canterbury TalesChaucer
Volume 23
Volume 24
- Gargantua and PantagruelFrançois Rabelais
Volume 25
- EssaysMichel de Montaigne
Volume 26
- Julius CaesarWilliam Shakespeare
Volume 27
Volume 28
Volume 29
- Don QuixoteMiguel de Cervantes
Volume 31
Volume 32
Volume 33
- Geometrical DemonstrationBlaise Pascal
- PenséesBlaise Pascal
Volume 34
Volume 35
Volume 36
- Gulliver's TravelsJonathan Swift
Volume 38
Volume 39
- The Wealth of NationsAdam Smith
Volume 42
Volume 43
Volume 44
Volume 45
- Experimental Researches in ElectricityMichael Faraday
- The Analytical Theory of HeatJoseph Fourier
Volume 46
- Philosophy of RightGeorg Wilhelm Friedrich Hegel
Volume 48
- Moby DickHerman Melville
Volume 49
- On the Origin of SpeciesCharles Darwin
- The Descent of ManCharles Darwin
Volume 50
- CapitalKarl Marx
- The Communist ManifestoKarl Marx and Friedrich Engels
Volume 51
- War and PeaceLeo Tolstoy
Volume 52
- The Brothers KaramazovFyodor Dostoevsky
- The Master BuilderHenrik Ibsen
Volume 53
- PragmatismWilliam James
- The Principles of PsychologyWilliam James
Volume 54
- The Interpretation of DreamsSigmund Freud
Other works

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Library · Elements

Book I

Euclid

Elements NextDefinitions

THEORY OF ANGLES, TRIANGLES, PARALLEL LINES, AND PARALLELOGRAMS.

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