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Euclid's Elements Book XI

Solid geometry: planes, perpendiculars, parallelepipeds, prisms. 39 propositions, 28 definitions. Depends on Books I and VI.

Propositions 1–13 Planes, perpendiculars, parallel lines Propositions 14–26 Parallel planes, solid angles, parallelepipeds Propositions 27–39 Parallelepiped ratios, prisms