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Subsection: Definitions from Book 1

This subsection lists the definitions of Book 1 of "Euclid's Elements". Euclid’s definitions avoid figures. At BookofProofs, figures are given for the most definitions.

Table of Contents

  1. Definition: 1.01: Point
  2. Definition: 1.02: Line, Curve
  3. Definition: 1.03: Intersections of Lines
  4. Definition: 1.04: Straight Line, Segment and Ray
  5. Definition: 1.05: Surface
  6. Definition: 1.06: Intersections of Surfaces
  7. Definition: 1.07: Plane
  8. Definition: 1.08: Plane Angle
  9. Definition: 1.09: Angle, Rectilinear, Vertex, Legs
  10. Definition: 1.10: Right Angle, Perpendicular Straight Lines
  11. Definition: 1.11: Obtuse Angle
  12. Definition: 1.12: Acute Angle
  13. Definition: 1.13: Boundary
  14. Definition: 1.14: Plane Figure
  15. Definition: 1.15: Circle, Circumference, Radius
  16. Definition: 1.16: Center of the Circle
  17. Definition: 1.17: Diameter of the Circle
  18. Definition: 1.18: Semicircle
  19. Definition: 1.19: Rectilinear Figure, Sides, n-Sided Figure
  20. Definition: 1.20: Equilateral Triangle, Isosceles Triangle, Scalene Triangle
  21. Definition: 1.21: Right Triangle, Obtuse Triangle, Acute Triangle
  22. Definition: 1.22: Square, Rectangle, Rhombus, Rhomboid, Trapezium
  23. Definition: 1.23: Parallel Straight Lines

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