Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-6-1323-2441-2 |
Объём: | 76 страниц |
Масса: | 135 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 1 |
High Quality Content by WIKIPEDIA articles! In geometry, a rhombohedron is a three-dimensional figure like a cube, except that its faces are not squares but rhombi. It is a special case of a parallelepiped where all edges are the same length. In general the rhombohedron can have three types of rhombus faces in congruent opposite pairs. If all of the non-obtuse internal angles of the faces are equal (all faces are same), it can be called a trigonal trapezohedron. Another special case is that, where there is a plane of symmetry through four vertices (with symmetry group C2h), and a special case of that, where there is another plane of symmetry through the other four vertices (with symmetry group D2h).
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