Polygons and Types of Quadrilaterals

Geometry and Measures Polygons and Types of Quadrilaterals

🎬 Video Tutorial

(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 $(n – 2) \times 180^\circ$, 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).

📂 Revision Cards

Illustrating polygons as 2D closed shapes with straight line segments, showing a triangle and star, and non-polygons like curved shape and 3D cube. — 1) Polygons vs non-polygons

Table showing polygons with their corresponding number of sides. — 2) Regular Polygons

Table showing polygons, their number of sides, and sum of interior angles. Triangle (180°), quadrilateral (360°), pentagon (540°), and hexagon (720°). — 3) Interior Angles of Polygons

Illustrating special types of quadrilaterals, highlighting their unique properties such as parallel sides and equal angles. — 4) Special Quadrilaterals

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