There's no such thing as a two-sided polygon. In order for a shape to be a polygon, it has to have at least three sides.
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A regular polygon must have all sides (and angle) equal.An irregular polygon does not have to have all sides equal, but some may be equal.An irregular hexagon may have 2, 3, 4 or 5 equal sides.
It could be an irregular polygon with 6 or more sides.
It is an isosceles triangle that has two equal sides
A rhombus or a parallelogram
It is impossible to create a 2D shape using only 2 straight lines. The smallest polygon has 3 sides - a triangle.