Simple and Complex Quadrilaterals

Based on the presence of intersecting sides, all quadrilaterals are classified into two groups: simple and complex.

What is a Simple Quadrilateral

A simple quadrilateral is a type of quadrilateral having no self-intersecting sides. It can be either convex or concave.

Examples: A square, a rectangle, a parallelogram, a rhombus, and a trapezoid are simple convex quadrilaterals, while a dart or an arrowhead is a simple concave quadrilateral.

What is a Complex Quadrilateral

Also known as a crossed quadrilateral, it is a type of quadrilateral having self-intersecting sides. A complex quadrilateral is also known as a bow-tie quadrilateral or butterfly quadrilateral.

Examples: A crossed trapezoid, a crossed-square, and a crossed-rectangle.