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Math Help - math help.. confused

  1. #1
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    math help.. confused

    A quadrilateral has vertices A (1, 1), B(3. 4), C(6, 2) and D(4, -1). How do I show that the DIAGONALS are perpendicular to each other.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by matty View Post
    A quadrilateral has vertices A (1, 1), B(3. 4), C(6, 2) and D(4, -1). How do I show that the DIAGONALS are perpendicular to each other.
    Matty, I answered this type of question in another one of your posts. In order to tell if two lines are perpendicular, check to see if the product of their slopes is -1.

    Find the slope of AC and BD. Multiply them together. Is the answer -1?
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