An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra, as well as concave ones. As a result the angles of octahedra vary over the whole range.Regular octahedra have a dihedral angle of [pi - arccos(1/3)] radians.
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An octagon has 8 sides, 8 vertices, 8 angles, and an octahedron is a cube. By: SupeRMAn
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An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
rectangle and octahedron
An octahedron has eight bases/faces.