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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:

Quadrilateral flow chart