A polygon is a 2-dimensional closed shape with straight sides.
The angles in a quadrilateral add up to 360º.
The simplest polygon is a triangle (a 3-sided shape). Polygons of all types can be regular or irregular.
A regular polygon has sides of equal length, and all its interior angles are of equal size.
Irregular polygons can have sides of any length and angles of any size.
Interior angle of a regular polygon = sum of interior angles ÷ number of sides
The exterior angles of a regular polygon always add up to 360°, so the exterior angle of a regular hexagon is