4
4
Yes,I think it has got one
A square has four perpendicular sides.
At least two pairs: they form the outer rectangle which represents the "universe".
2 * * * * * While that is possible, so is 0, 1, 3, 4, 5 or 6!
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. The number of perpendicular faces will depend on which particular octahedron you have in mind. The heptagon-based pyramid, for example, has none.
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
two.
An octahedron has 7 perpendicular lines.
a octahedron has 8 faces
7
Each lateral face is perpendicular to its lateral neighbours so that makes 4 pairs. In addition, opposite lateral faces may be perpendicular, making 6 pairs in all.
1 at the base
A truncated octahedron has 14 faces.
A pentagonal prism has only 7 faces. Each of the five lateral faces is perpendicular to the two bases: that makes 10 pairs of mutually perpendicular faces. In general, the lateral faces are not perpendicular, but four of them may be perpendicular to one or more of its neighbors - at most 4 more pairs. Still not 25!
A triangular pyramid has four faces and 2 pairs.
An octahedron has 8 sides.An octahedron is a polyhedron with eight plane faces.