Special Cases
For parallelepipeds with a symmetry plane there are two cases:
- it has four rectangular faces
- it has two rhombic faces, while of the other faces, two adjacent ones are equal and the other two also (the two pairs are each other's mirror image).
See also monoclinic.
A cuboid, also called a rectangular parallelepiped, is a parallelepiped of which all faces are rectangular; a cube is a cuboid with square faces.
A rhombohedron is a parallelepiped with all rhombic faces; a trigonal trapezohedron is a rhombohedron with congruent rhombic faces.
Read more about this topic: Parallelepiped
Famous quotes containing the words special and/or cases:
“The treatment of the incident of the assault upon the sailors of the Baltimore is so conciliatory and friendly that I am of the opinion that there is a good prospect that the differences growing out of that serious affair can now be adjusted upon terms satisfactory to this Government by the usual methods and without special powers from Congress.”
—Benjamin Harrison (1833–1901)
“... in all cases of monstrosity at birth anaesthetics should be applied by doctors publicly appointed for that purpose... Every successive year would see fewer of the unfit born, and finally none. But, it may be urged, this is legalized infanticide. Assuredly it is; and it is urgently needed.”
—Tennessee Claflin (1846–1923)