A shape with 8 sides is an octagon
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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