the answer is a square pyramid
The question is ambiguous. An octagon is a 2-dimensional shape with 8 edges and 8 vertices. Does a 3-D octagonal shape mean one with 8 edges or 8 faces or vertices, or faces which are 2d octagons?
It is a cuboid that has 8 vertices, 12 edges and 6 faces
A heptagonal pyramid.
A quadrilateral-based pyramid has 5 vertices, 8 edges and 5 faces
an OCTAGON
an octogon
A U shaped room has 8 edges on the floor, 8 on the roof and 8 vertical edges, making 24
An Octagon
the answer is a square pyramid
If that shape is a polygon then its named an octagon.
That's an impossible shape. No shape can have only 2 edges.
A cube.
there are none
The question is ambiguous. An octagon is a 2-dimensional shape with 8 edges and 8 vertices. Does a 3-D octagonal shape mean one with 8 edges or 8 faces or vertices, or faces which are 2d octagons?
It is a cuboid that has 8 vertices, 12 edges and 6 faces
It is a cuboid that has 8 vertices, 12 edges and 6 faces