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    EminemBaby's Avatar
    EminemBaby Posts: 1, Reputation: 1
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    #1

    Apr 23, 2007, 10:51 PM
    Magnitude of a line
    Points A(-8,3) and B(1,-9) are the initial and that terminal points of line AB. Find the magnitude of line AB.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Apr 23, 2007, 11:31 PM
    You know pythagoras' theorem don't you?

    Draw the points on a graph, and draw a right angled triangle with the line AB as the hypotenuse, and the other 2 sides in the x and y directions respectively.

    You can work out what both of the other sides are can't you? So you can also work out how long the hypotenuse is!
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