What are true about polygons?

Polygons are closed, two-dimensional shapes composed of straight line segments that connect at vertices. They can have any number of sides, with the simplest being a triangle (three sides) and the most complex being a shape with many sides, like a decagon (ten sides) or more. Polygons can be classified as regular, with all sides and angles equal, or irregular, with varying lengths and angles. Additionally, the sum of the interior angles of a polygon can be calculated using the formula (n-2) × 180°, where n is the number of sides.