If ABCD is a quadrilateral, is AB = BC = CD = DA?
1. AC is perpendicular to BD
2. \(AB + CD = BC + AD\)
Answer is E. But as far as I learned in school, the ONLY 2 quadrilaterals that have perpendicular diagonals are the rhombus and the square and both have all sides equal. I do not find the explanation correct.
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