Platonic
Prism!
They are prisms. The bases may be any polygons with three or more sides.
Both a cylinder and a prism can have parallel and congruent bases.
Isosceles TetrahedronA solid with four faces is a tetrahedron. Each of the faces is a triangle. If all the triangles are congruent, you have an isosceles tetrahedron.
An irregular polyhedron is a solid shape in which either all edges are not the same length, or all faces are not congruent polygons or all [solid] angles are not of the same measure.
Prism!
A prism.
They are prisms.
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They are prisms. The bases may be any polygons with three or more sides.
It is called a prism.
A solid figure that has two congruent polygons as bases and lateral faces that are rectangles is called a prism. In a prism, the two bases are parallel and congruent, while the lateral faces connect the corresponding sides of the bases and are rectangular in shape. The type of prism is often specified by the shape of its bases, such as triangular prism or rectangular prism.
Sounds like a rectangular solid to me, such as an elongated box.
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 could be a prism, but need not be. A regular dodecahedron, for example, is not a prism but has parallel and congruent pentagonal bases. You can also have any antiprism (see link).
A cylinder is a geometric solid with two circular bases.
Cube