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| =Additional Information= | | =Additional Information= |
| ==Useful websites== | | ==Useful websites== |
− | 1. Effective Introduction to Quadrilateral [[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/]]<br>
| + | * Effective Introduction to Quadrilateral [[http://www.shodor.org/ihnteractivate/discussions/Quadrilaterals/]]<br> |
− | 2. Quadrilateral is also tetragon, quadrangle [[http://www.mathopenref.com/quadrilateral.html]]<br>
| + | * Quadrilateral is also tetragon, quadrangle [[http://www.mathopenref.com/quadrilateral.html]]<br> |
− | 3. [[http://www.mathsisfun.com/quadrilaterals.html]]
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| ==Reference Books== | | ==Reference Books== |