Sun November 27, 2011 By: Venkataravind Mohan

If the diagonals of the quadrilateral are equal how to prove it is a parallelogram ?

Expert Reply
Mon November 28, 2011
This statement is false. 
If the diagonals of a quadrilateral are equal, it need not be a parallelogram.
For example see in the following diagram which I have made in the figure below
both the diagonals are equal and it is not a parallelogram.
So you need more information if you want to prove it is a parallelogram.
With this alone information, it is wrong to say that is a parallelogram 
which is shown in the above figure.
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