Polyhedron (plural polyhedra)
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There can be no such shape. If there were a shape with n flat surfaces, then if you sliced off one vertex, you would have a shape with n+1 flat surfaces. So it is always possible to add one more flat surface.
One whose boundaries are straight lines.
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Flat shapes such as polygons are two-dimensional.
Well, honey, shapes that have only flat surfaces are called polygons. Think of your squares, triangles, and pentagons - they're all as flat as a pancake. So, if you're looking for some dimensionless divas, polygons are where it's at.
true
A sphere
a rectangle
cube There are a great many solid shapes that have only flat surfaces.
Yes and its flat surface faces are in regular shapes.
A cube