A prism is a solid figure, contained by planes, of which the two opposite (planes) are equal, similar, and parallel, and the remaining (planes are) parallelograms.
A prism (or a hexahedron, or a parallelepiped) is a three-dimensional polyhedron with two congruent opposite convex rectilinear figures and the remaining faces being parallelograms. Important special cases of prisms are:
Some general prisms, whose opposite congruent convex faces are triangles (left) or trapezia (right):
A paralellelepiped (left) and a rectangular parallelepiped (right):
Corollaries: 1 2
Definitions: 3
Lemmas: 4
Proofs: 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Propositions: 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39