An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Some of these have no parallel sides whereas a right hexagonal prism has 3 quartet of parallel sides and one sextet.
An octahedron has 7 perpendicular lines.
None
None
Infinite
14
2
2
1 pair
parellel lines
No
An octahedron has 9 lines of symmetry. These lines can be categorized into three types: four lines that connect the midpoints of opposite edges, six lines that connect opposite vertices, and one line that runs through the centers of opposite faces. This symmetry reflects the octahedron's balanced and regular geometric structure.
Parellel lines