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Math Help - Distance formula

  1. #1
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    Distance formula

    I have to find the distance for the the points -1,1 at 135 degrees. (Find the distance d from the origin to that point) Using the distance formula, I am getting a 0. Is this correct?
    Last edited by goldbug78; January 30th 2013 at 12:25 PM.
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  2. #2
    Super Member ebaines's Avatar
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    Re: Distance formula

    It should be obvious that the distance between the point (1,1) and (0,0) is not 0. The formula for distance betwen points A and B is:

     d = \sqrt{(x_A - x_B)^2 + (y_A - y_B)^2}

    Here point A is  (x_A,y_A) = (1,1) and point B is (x_B,y_B)=(0,0).
    Last edited by ebaines; January 30th 2013 at 12:33 PM.
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  3. #3
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    Re: Distance formula

    so 2 squared then?
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  4. #4
    Super Member ebaines's Avatar
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    Re: Distance formula

    Not 2 squared, but square root of 2.
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  5. #5
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    Re: Distance formula

    Quote Originally Posted by goldbug78 View Post
    so 2 squared then?
    Please tell us what "I have to find the distance for the the points -1,1 at 135 degrees." means.

    What does 135^o have to do with any of this?
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  6. #6
    Super Member ebaines's Avatar
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    Re: Distance formula

    Quote Originally Posted by Plato View Post
    What does 135^o have to do with any of this?
    I think the OP is just saying that a line from the origin to the point (-1,1) is at an angle of 135 degrees from the +x axis. I considered it extraneous information.
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