A polyhedron where all vertices lie in two parallel planes. Under some circumstances I forget it is called a prismoid. Some particular families of prismatoids:
Prisms, where the polygons in each plane are congruent and joined by rectangles or pallelograms;
Antiprisms, where the polygons in each plane are congruent and joined by an alternating strip of triangles;
Frustrums[?], where the polygons are similar and joined by trapezoids;
Pyramids, where one plane contains only a single point;
Cupolas, where the polygon in one plane contains twice as many points as the other and is joined to it by alternating triangles and rectangles.
All Wikipedia text
is available under the
terms of the GNU Free Documentation License
Search Encyclopedia
Search over one million articles, find something about almost anything!
... midway between Erdmann and Gabler on the one hand, and the "extreme left" represented by Strauss, Feuerbach and Bruno Bauer.
Of his numerous writings, the following may ...