because polygons are closed shapes with no rounded parts so a 2 sided polygon is not real!
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Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.
Quadrilaterals. Parallelograms have two pairs of parallel sides.
Any polygon with 4 or more sides can have 2 parallel sides.
3 or more sides. It is impossible to make a polygon out of two sides.