▶ Quadrangle

A quadrangle is a polygon with four sides and four angles. It is also called a quadrilateral.

Examples of quadrangles include:

• Squares
• Rectangles
• Parallelograms
• Trapeziums (trapezoids)

Key Fact:
The interior angles of any quadrangle always add up to 360°.

Quadrangles are important in geometry because many everyday shapes — like windows, books, and screens — are four-sided.