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Quadrilaterals (view source)

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=Additional Information=

==Useful websites==

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* Effective Introduction to Quadrilateral [[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/]]<br>

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* Effective Introduction to Quadrilateral [http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/ click here]<br>

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* Quadrilateral is also tetragon, quadrangle [[http://www.mathopenref.com/quadrilateral.html]~~]<br>~~

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* Quadrilateral is also tetragon, quadrangle [http://www.mathopenref.com/quadrilateral.html click here]

==Reference Books==

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