The coordinates of quadrilateral ABCD are A (-1, -5), B (8 ,2 ), C (11, 13) and D (2, 6). Using coordinate geometry, prove that quadrilateral ABCD is a rhombus.
1 Expert Answer
One way to prove that ABCD is a rhombus is to prove that its diagonals are perpendicular.
Show that the slope of AC is the negative reciprocal of BD!
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