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Math Help - Check my answer (gradients)

  1. #1
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    Check my answer (gradients)

    Triangle ABC have coordinates (1,5)(-3,7) and (-2,-1)
    show the triangle is right - angled.

    mAB= 5-7/1--3 = - 1/2
    mBC= 7--1/-3--2 = -1 1/5
    mCA= -1-5/-2-1= 2/1 = 2

    -1/2 and 2 are perpendicular gradients meaning it is a right angle



    Am i right with this question or COMPLETELY off the mark???
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  2. #2
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    Quote Originally Posted by RubbishAtMaths View Post
    Triangle ABC have coordinates (1,5)(-3,7) and (-2,-1)
    show the triangle is right - angled.

    mAB= 5-7/1--3 = - 1/2
    mBC= 7--1/-3--2 = -1 1/5
    mCA= -1-5/-2-1= 2/1 = 2

    -1/2 and 2 are perpendicular gradients meaning it is a right angle



    Am i right with this question or COMPLETELY off the mark???
    Yes- right on the mark! Although in the future use brackets

    (5-7)/(1-(-3))
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  3. #3
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    Yay! im gonna breeze through this exam

    oh yeah i will use brackets in future
    Last edited by RubbishAtMaths; December 29th 2008 at 08:41 AM. Reason: forgot
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