Polygon: A simple closed curve made up of only line segments is called a polygon.
Classification of polygons:
|Number of Sides||Classification|
Diagonal: A diagonal is a line segment connecting two non-consecutive vertices of a polygon.
Convex polygons: Where all the interior angles are less than 180° and no part of its diagonals lie outside the polygon.
Concave polygons: Where at least one interior angle is more than 180° and some of the diagonals will lie outside the polygon.
Regular polygons: A regular polygon is both 'equiangular' and 'equilateral'. e.g. equilateral triangle.
Irregular polygons: Polygons which are not equiangular or equilateral are irregular polygons. e.g. right-angled triangle.
Angle sum property: Sum of all interior angles = \( (n - 2) \times 180° \) where n --> number of interior angles.