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An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. One of the 257 is a quadrilateral based dipyramid. A special case of this shape a square based right dipyramid. So a special case of one out of 257 possible convex versions is regular. However, despite the fact that the vast majority of octahedra are not regular, the term is often used to refer to the regular version.

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Q: Is octahedron a regular shape
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