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    Ac cool's Avatar
    Ac cool Posts: 1, Reputation: 1
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    #1

    Feb 13, 2013, 08:04 PM
    True or false answers to my question
    All of the adjacent sides of quadrilaterals have slopes with a product of -1 True or false?
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #2

    Feb 13, 2013, 08:20 PM
    What do you think, and why?
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    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Feb 14, 2013, 06:34 AM
    Here's a hint: the slopes of two lines that are perpendicular to each other are the negative inverse of each other. In other words if the slope of one line is 'm,' then the slope of a line that is perpendicular to it is -1/m. What does this mean for the product of the slopes of perpendicular lines? And how does this apply to adjacent sides of quadrilaterals?
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