A heptahedron is a closed 3-d shape with 7 polygonal faces. There are 34 topologically different convex heptahedra and, since none of these are regular, the term is ambiguous. There can be:no parallel edges,five pairs of parallel edges and two quintet,three quartets,two pairs and one tripletas well as many other combinations.
3 pairs of parallel faces
A cuboid has 3 pairs of parallel faces.
It can have one, two or three pairs of parallel faces.
3 pairs
A heptahedron is a closed 3-d shape with 7 polygonal faces. There are 34 topologically different convex heptahedra and, since none of these are regular, the term is ambiguous. There can be:no parallel edges,five pairs of parallel edges and two quintet,three quartets,two pairs and one tripletas well as many other combinations.
A heptahedron has seven faces, like a heptagon has seven sides.
3 pairs of parallel faces
A cuboid has 3 pairs of parallel faces.
A heptahedron has 7 faces, including 6 triangular faces and one hexagonal.
There are 257 topologically different convex octahedra. Many of these will have no parallel faces. It can have four pairs of parallel faces.
It can have one, two or three pairs of parallel faces.
3 pairs
3 pairs
Three.
Three pairs.
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