Question #1 from the August 2015 Geometry (Common Core) Regents Examination got me to thinking of some of the issues that arose in class back in my teaching days. This is step 1 in a creation that I hope will encompass all the key properties of a quadrilateral's diagonals, each phrased in the "If the diagonals of a quadrilateral are __________" style. Wish me luck!
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