Three possibilities that spring to mind are:
a diquadrilateral pyramid (two quadrilateral based pyramids with their bases stuck together)
or
a pentagonal pyramid
or
a triangular prism.
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cube 8
no. a 2d square has only 1 face but a 3d square (cube) has 6 faces.
The description given fits that of cones
Something with 6 faces and 8 vertices
A tetrahedron is the smallest possible polyhedron: a closed 3-d shape with polygonal faces. It has 4 triangular faces, 4 vertices and 6 edges.