An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. They can have faces/bases which are triangles, quadrilaterals, pentagons, hexagons or heptagons.
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It can be a heptagon (heptagonal pyramid), hexagon (hexagonal prism), square (square based bipyramid). There are versions with pentagonal or triangular bases but I cannot think of their names.
An octahedron has 8 sides.An octahedron is a polyhedron with eight plane faces.
An octahedron has 8 sides.
a octahedron has 8 faces
An octahedron is a 3D shape with 8 sides.