If a solid, it is called a "Polyhedron". If just lines in three dimensions, its called a "Three Dimensional Polygon". Polyhedron derives from Greek words for "many faced" or "many sided". Polygon derives from "many angles"
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A three-dimensional circle is called a sphere.
There is no such thing. A hexagon is a two dimensional figure. A three dimensional figure with six vertices is an octahedron.
dodecahedron
Trapozoidle
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