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Illustrative Math  

Congruence in Parallelograms

Is this a parallelogram?

http://www.illustrativemathematics.org/illustrations/1517

http://www.illustrativemathematics.org/illustrations/1321
     

 
       
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Math Bits   Geometer Sketchpad Acitivity http://mathbits.com/MathBits/GSP/Quadrilaterals.htm
     

 
       
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