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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):
find the slopes of AC and BD also find the mid points of AC an BD ,if they are same then parallelogram.
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