A prism.
It is a prism. More specifically, "A solid figure that has two bases that are parallel, congruent polygons and with all other faces that are parallelograms." This describes the general prism. Replace "polygons" with "triangles" and you have specified a triangular prism.
It is a pentagonal prism
They are prisms.
The faces of Platonic solids are regular polygons...
A prism.
It is a prism. More specifically, "A solid figure that has two bases that are parallel, congruent polygons and with all other faces that are parallelograms." This describes the general prism. Replace "polygons" with "triangles" and you have specified a triangular prism.
It is a pentagonal prism
Prism!
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They are prisms.
They are prisms. The bases may be any polygons with three or more sides.
It is called a prism.
A PRISM is a solid whose side faces are parallelograms and whose ends(or bases ) are congruent parallel rectilinear figures.
The faces of Platonic solids are regular polygons...
This is a general description of an oblique prism. Use the link to learn more.
In optics a prism is a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light. In geometry a prism is a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms. In crystallography a prism is a form having faces parallel to the vertical axis and intersecting the horizontal axes.