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Quadrilaterals (view source)

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==Useful websites==

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

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2. [[http://www.mathopenref.com/quadrilateral.html]]<br>

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

3. [[http://www.mathsisfun.com/quadrilaterals.html]]

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