3 or more sides. It is impossible to make a polygon out of two sides.
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Any polygon with 4 or more sides can have 2 parallel sides.
1) all sides are straight 2) more than 2 sides 3) all have vertices
Rectangles are parallelograms. Parallelograms are polygons that has 2 or more pairs of parallel sides.
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.
Quadrilaterals. Parallelograms have two pairs of parallel sides.