A triangle, square or pentagon.
triangles and pentagons
A triangle, square or pentagon.
A regular octahedron is one of the platonic solids. Each of its faces is an equilateral triangle.
A Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex. They have the unique property that the faces, edges and angles of each solid are all congruent. Some examples are bricks, a dice, tissue boxes and houses.
face
triangles and pentagons
A cubeoid is not a platonic solid because it does not have equal edges and angles like a platonic solid. Platonic solids have regular polygon faces where each face, edge, and vertex is the same. Cubeoids have rectangular faces and unequal edges and angles.
A solid with a regular polygon for each face is known as a perfect solid.
A triangle, square or pentagon.
From Wikipedia:A Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex. Moreover, all its edges are congruent, as are its vertices and angles.
A Platonic solid.A Platonic solid.A Platonic solid.A Platonic solid.
A regular octahedron is one of the platonic solids. Each of its faces is an equilateral triangle.
A polygon is a many sided 2-dimensional figure, and thus could never be "solid" Alternatively, it could be "one face that is a polygon". In that case the solid could be like a pyramid that morphs into a cone or a part-sphere. The base would be the one polygon, the other face would not.
A Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex. They have the unique property that the faces, edges and angles of each solid are all congruent. Some examples are bricks, a dice, tissue boxes and houses.
face
tetrahedron
No. All the faces of a Platonic solid are identical regular polygons.