Proving a Figure is a Square

If you are given quadrilateral DEFG as marked (a quadrilateral with 4 congruent sides is the only thing marked), what additional information is most helpful if you want to prove that the figure is a square?

A.) Line DF bisects both

That it has 4 right angles. Please contact me if you need further help
Jonathan C.
29 January 2013
With a square all 4 side must be of equal length and all 4 angles must be right angles. If you knew the length of the diagonal across the centre you could prove this by Pythagoras.
31 January 2013
Is it a formal proof that you are reqired to produce? If so get in touch.
19 February 2013
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