Two straight lines cannot enclose a space - therefore three lines is the minimum requirement for a polygon.
I would like to note that a digon is a polygon and it has 2 sides. Therefore, the minimum is 2. However, some people call a digon an improper polygon since it contradicts the definition of polygon. A digon can only be made on a sphere, so the answer is never truly correct.
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Any number above 3 sides which is the minimum
The number of sides possible in a polygon is a minimum of 3, with an unlimited maximum. For a regular polygon, as the number of sides approaches infinity, it approaches the shape of a circle.
The minimum number is '3'.
No fixed number. The minimum is 3 sides, for a triangle. Beyond about 20 sides, it's difficult to distinguish it visually from a circle.
A polygon is a shape with multiple sides. There are an infinite number of polygons, as the polygon is classified by the number of sides.