Definition
A quadrilateral is a polygon with exactly four sides, four vertices, and four angles. Rectangles, squares, and trapezoids are all quadrilaterals.
The prefix "quad" means four. Any closed shape with four straight sides is a quadrilateral, no matter how it looks.
Examples
- A square is a special quadrilateral with 4 equal sides.
- A rectangle is a quadrilateral with 4 right angles.
- A kite shape is also a quadrilateral.