Quadrangles (Quadralaterals)

A quadrangle (quadrilateral) is a polygon with

· 4 sides

· 4 angles

· 4 vertices

Parallelograms:

A parallelogram is a quadrangle with 2 pairs of parallel lines.

(Lines are parallel if they are everywhere the same distance apart.)

Here are some figures that are not parallelograms:

Quadrangles that are Parallelograms:

Quadrangles that are not Parallelograms: