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I've never learned of that theorem. And looking through my notes and textbook, I can'd find any info on it.

I just figured an easier way to prove, for anyone interested: -Prove AC = BD (ie diagonals equal length) -Prove m(AC) * m(BD) = -1 (ie perpindicular.) Thus, Square. ...Well, if anyone's still wondering.

I can't be bothered to write anything out or find B, C or D, but I'm assuming you can do the following: - Prove AB = BC = CD = AD - Prove AB is perpendicular to BC or CD. - Therefore, square. (equal sides, right angle.)