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There is no "most" with respect to polygons. You could make a shape with a million sides, and then make a new shape with a million and one, and keep going forever.
A trapezium could do that. Moreover, I think any polygon with an even number of sides also could.
It could be an irregular polygon with 6 or more sides.
It could be a right angle triangle
You could measure the sides of a shape and use trigonometry.