An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. The number of diagonals will depend on which one of the 257 octahedra you have in mind.
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An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. The number of diagonals will depend on the precise shape.
An octahedron has eight bases/faces.
An octahedron has eight faces. If it has 62 faces then it is not an octahedron!
An octahedron has 7 perpendicular lines.
An octahedron has 8 sides.