A regular octahedron is one of the platonic solids. Each of its faces is an equilateral triangle.
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An octahedron is not a polygon. A polygon is a two dimensional shape. An octahedron is a three dimensional shape and is classified as a polyhedron.
An octahedron is an eight-sided polyhedron (which is a three-dimensional polygon).
An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
It is called a face of the polyhedron.
equilateral triangle