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A prismatoid is a polyhedron where all vertices lie in two parallel planes. Under some circumstances it is called a prismoid. Some particular families of prismatoids:
- Prisms, where the polygons in each plane are congruent and joined by rectangles or parallelograms;
- Antiprisms, where the polygons in each plane are congruent and joined by an alternating strip of triangles;
- Frustums, 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.
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