Polygons – Based on Regularity

• A regular polygon has all its sides equal in length and all its angles equal in measure.
• An irregular polygon does not have all the sides equal in length and angles are also not equal in measure.

Concave and Convex Polygon

• A convex polygon has all its interior angles less than 180 degrees. The diagonals of a convex polygon lie within the polygon.
• A concave polygon has at least one of its interior angles to be more than 180 degrees. Also, not all the diagonals of the concave polygon lie within the shape.