Answers

2016-02-17T19:43:39+05:30
I am quite sure you meant Triangle ABC
also i believe that you are referring to ABXC as a parallelogram

We must use the property  of  a parallelogram where diagonal bisect each other..

Look in the figure below we have 

AD = DX (FROM DATA){ONE SET OF DIAGONALS}

Now  AD is the median

∴ BD = CD

Now from the above 2 equation we gaet the diagonals bisect each other hence it is a parallelogram




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