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Verify that parallelogram ABCD with vertices A(-5, -1), B(-9, 6), C(-1, 5), and D(3, is a rhombus by showing that it is a parallelogram with perpendicular diagonals.​
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Verify that parallelogram ABCD with vertices A(-5, -1), B(-9, 6), C(-1, 5), and D(3, is a rhombus by showing that it is a parallelogram with perpendicular diagonals.​

Verify that parallelogram ABCD with vertices A(-5, -1), B(-9, 6), C(-1, 5), and D-example-1
User Shawnzhu
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multiplication of the gradients of the two diagonals is equals to -1 if they are perpendicular

Verify that parallelogram ABCD with vertices A(-5, -1), B(-9, 6), C(-1, 5), and D-example-1
User Ilovelamp
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