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OpenStudy (anonymous):
Verify that parallelogram ABCD with vertices A(–5, –1), B(–9, 6), C(–1, 5), and D(3, –2) is a rhombus by showing that it is a parallelogram with perpendicular diagonals.
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OpenStudy (anonymous):
the slope of two pairs of lines is same ... diagonals bisect perpendicular .. length of sides is same...
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