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Math Help - Length of a line segment.

  1. #1
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    Length of a line segment.

    The question: List all the points that have whole-number coordinates and are

    a) 5 units from the origin
    b) 10 units from the origin


    for a, since its 5 units I used the line segement formula, l^2=[(x2-x1)^2]+[(y2-y1)^2], and set 25 equal to the formula, but I got 25=(x2)^2 + (y2)^2.

    To find the whole number coordinates is it trial and error or is there some way to find the values of x2 and y2 that would give whole number coordinates.
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  2. #2
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    Re: Length of a line segment.

    Quote Originally Posted by darksoulzero View Post
    The question: List all the points that have whole-number coordinates and are
    a) 5 units from the origin
    b) 10 units from the origin
    For a) Are all of these such points (\pm 5,0)~\&~(0,\pm 5)~?

    Is it true that [\pm 3]^2+[\pm 4]^2=25~?

    Are there any others?
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