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Perfect parallelograms. (English)
Am. Math. Mon. 119, No. 6, 513-515 (2012).
Summary: A parallelogram, with its sides and diagonals being positive integers, is called a perfect parallelogram. Up to scaling we find a parameterization for all perfect parallelograms (quadruples). As a special case, we determine the perfect rectangles (Pythagorean triples).
Classification: G45
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