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Subsection: Definitions from Book 11

This subsection lists the definitions from Book 11 of "Euclid’s Elements". Euclid’s definitions avoid figures. At BookOfProofs, figures are given for the most definitions.

Table of Contents

1. Definition: Def. 11.01: Solid Figures, Three-Dimensional Polyhedra
2. Definition: Def. 11.02: Surface of a Solid Figure
3. Definition: Def. 11.03: Straight Line at Right Angles To a Plane
4. Definition: Def. 11.04: Plane at Right Angles to a Plane
5. Definition: Def. 11.05: Inclination of a Straight Line to a Plane
6. Definition: Def. 11.06: Inclination of a Plane to a Plane
7. Definition: Def. 11.07: Similarly Inclined Planes
8. Definition: Def. 11.08: Parallel Planes
9. Definition: Def. 11.09: Similar Solid Figures
10. Definition: Def. 11.10: Equal Solid Figures
11. Definition: Def. 11.11: Solid Angle
12. Definition: Def. 11.12: Pyramid, Tetrahedron
13. Definition: Def. 11.13: Prism, Parallelepiped
14. Definition: Def. 11.14: Sphere
15. Definition: Def. 11.15: Axis of a Sphere
16. Definition: Def. 11.16: Center of a Sphere
17. Definition: Def. 11.17: Diameter of a Sphere
18. Definition: Def. 11.18: Cone
19. Definition: Def. 11.19: Axis of a Cone
20. Definition: Def. 11.20: Base of a Cone
21. Definition: Def. 11.21: Cylinder
22. Definition: Def. 11.22: Axis of a Cylinder
23. Definition: Def. 11.23: Bases of a Cylinder
24. Definition: Def. 11.24: Similar Cones, Similar Cylinders
25. Definition: Def. 11.25: Cube
26. Definition: Def. 11.26: Octahedron
27. Definition: Def. 11.27: Icosahedron
28. Definition: Def. 11.28: Dodecahedron

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