That is correct, a polygon must have at least 3 sides. So the simplest polygon is the triangle. There is no upper limit to the number of sides that a polygon can have, although when the number of sides becomes very large, a regular polygon increasingly resembles a circle.
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A 3 sided polygon is the shape of a triangle.
A 3-sided shape is called a triangle.or Polygon in general.
Its called a pentahedron. Its a five sided or faceted polygon.
There is no such shape because shapes or polygons must have 3 or more sides and there are 3 interior angles in a 3 sided polygon which is a triangle that add up to 180 degrees.
It is the only polygon whose side lengths determine its shape.