An insignificantly small fraction.
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There are no polygons (shapes with only straight-line sides) with fewer than three sides, but if you allow shapes with curved sides there are many possibilities. Examples include semicircles, annuli (donut shaped), and crescents.From Caromal, and Izzyk9God just say a CONE!!!
There are a few simple shapes with equal sides. The basic shapes are a square, octagon, and an equilateral triangle,
For two dimensional shapes, a vertex (plural vertices) is a point where two sides meet.For 3D shapes, a vertex is a point where three or more faces meet.
from there sides
There is no special name: they are polygons, as are shapes with 3 or 3 million sides.