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Math Help - Orthocentre Question Helpp

  1. #1
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    Orthocentre Question Helpp

    Triangle ABC has vertices A(3,5), B(2,3), C(5,2)

    Ineed the equations of the three altitudes

    inoe wht ihav to doo but ikepp messing up for some reason

    slope of ab= (3-5/2-3)= -2/1
    slope of bc = ( 2-3/5-2) = -1/3
    slope of ca = (5-2/3-2)= 3/1


    idont now where to go from here and iget messed up with the negative recipricol

    and then i need to find the intersection point of any two altitudes

    can yu show me in steps for me to get good at this and easy for me\


    thnxxxxx
    Last edited by ahmads121; October 14th 2009 at 06:35 PM.
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  2. #2
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    Quote Originally Posted by ahmads121 View Post
    Triangle ABC has vertices A(3,5), B(2,3), C(5,2)
    I need the equations of the three altitudes
    slope of ab= (3-5/2-3)= -2/1
    slope of bc = ( 2-3/5-2) = -1/3
    slope of ca = (5-2/3-2)= 3/1
    For one, you have trouble with signs. Slope AB is 2. Slope AC is -3/2.
    The altitude is perpendicular to the side.
    So the slope of the altitude to AB is -1/2.
    Now use that slope and the point C to write the equation of the altitude.
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