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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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Q: What are the angles of a octahedron?
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