No polygon can have less than three sides.
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Nope.
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.
A polygon is a 2-dimensional closed figure that has at least three sides. A pentagon is a 2-dimensional closed figure that has five and only five sides, so it is a kind of polygon.
A polygon with 6 sides is a hexagon and a polygon with 8 sides is an octagon
The formula for the sum of the interior angles of a polygon is: 180 * (n - 2) where n is the number of sides of the polygon. So the sum of the angles of a polygon with 25 sides is 180 * 23 = 4,140.