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1. [[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/]]
 
1. [[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/]]
 
2. [[http://www.mathopenref.com/quadrilateral.html]]
 
2. [[http://www.mathopenref.com/quadrilateral.html]]
 +
3. [[http://www.mathsisfun.com/quadrilaterals.html]]
    
==Reference Books==
 
==Reference Books==

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