8 octagons
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An octahedron is a 3D shape with 8 sides.
octahedron
the flat ones
Octahedron
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Some simple octahedra area regular octahedron (also known as a square-based dipyramid or triangular antiprism)heptagon-based pyramidhexagon-based prism.So an octahedron is not a single shape.