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→Useful websites
* Effective Introduction to Quadrilateral [http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here]<br>
* Effective Introduction to Quadrilateral [http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here]<br>
* Quadrilateral is also tetragon, quadrangle [http://www.mathopenref.com/quadrilateral.html click here]
* Quadrilateral is also tetragon, quadrangle [http://www.mathopenref.com/quadrilateral.html click here]
* http://www.slideshare.net/muzzu1999/types-of-quadrilaterals-and-its-properties-group-4 : This website has a very good avtivity on properties of quadrilaterals.
==Reference Books==
==Reference Books==