(0:01) Definition of Polygons: A polygon is a two-dimensional, closed shape made only of straight line segments, with no gaps or curved edges.

(0:56) Naming Polygons by Sides: Triangles (3 sides), quadrilaterals (4 sides), and pentagons (5 sides) etc.

(1:29)Sum of Interior Angles: The sum of a polygon’s interior angles is given by the formula (n – 2) Ã— 180Â°, where n is the number of sides.

(2:01)Types of Quadrilaterals: Include trapeziums (at least one pair of parallel sides), parallelograms (both pairs parallel), rectangles (right angles), rhombuses (equal sides), and squares (equal sides and right angles).