They are polygons and they have 3 or more sides
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Flat shapes such as polygons are two-dimensional.
none!all shapes are flat
A polyhedron.
If they are flat two dimensional shapes with three or more sides, they are called polygons. If they are solid figures, they are called polyhedrons. The words come from Greek: Polugonos = many angled Poluedros - many sided Both definitions taken from my Concise Oxford English Dictionary.
The flat side so the solid that lays flat without moving.