A triangle, square or pentagon.
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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