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The Epic Interactive Encyclopedia 1997
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1992-09-02
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In geometry, an equilateral (all sides equal)
parallelogram. Its diagonals bisect each
other at right angles, and its area is half
the product of the lengths of the two
diagonals. A rhombus whose internal angles
are 90 degrees is called a square. A square,
therefore, is the only rhombus that is also a
rectangle.