Identifying Quadrilaterals

Quadrilaterals are four-sided, two-dimensional figures.  We classify quadrilaterals based upon:

• Whether or not the sides (1 pair or both pairs) are parallel;
• Whether or not the sides are equal;
• Whether or not the angles are right angles. 

Some quadrilaterals are just quadrilaterals (they belong to no more specific categories).  Other quadrilaterals belong to many quadrilateral categories (e.g., a square is a rectangle, a rhombus, a parallelogram, and a quadrilateral!).

Use the flow chart below to see how to categorize quadrilaterals: