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    curtz91's Avatar
    curtz91 Posts: 2, Reputation: 1
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    #1

    Jul 15, 2009, 03:38 PM
    Lengths of a rectangle.
    The length of a rectangle is 7m more than the width. The length of a diagonal is 13m. Find the length.
    YoungHyperLink's Avatar
    YoungHyperLink Posts: 152, Reputation: 13
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    #2

    Jul 15, 2009, 03:51 PM

    Sorry, we can't do your homework for you! Do you know what rules to use?
    ZoeMarie's Avatar
    ZoeMarie Posts: 2,049, Reputation: 468
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    #3

    Jul 15, 2009, 04:12 PM

    Do you know how to find the length of sides of a triangle? Because basically that's what you're doing? I don't want to do your homework for you either, but you would have your one side (the diagonal) 13m, one side n meters and another side n+7 meters. Do you know how to solve this? If it's a rectangle you know you're dealing with 90 degree angles. Check out this site

    http://www.gcseguide.co.uk/sin,_cos,_tan.htm

    edit: don't listen to me... I get confused. I've been helping my husband with his math homework but the stuff he needed help with was sin cos and tan so that's drilled in my head right now.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #4

    Jul 15, 2009, 05:03 PM
    Quote Originally Posted by curtz91 View Post
    The length of a rectangle is 7m more than the width. The length of a diagonal is 13m. Find the length.
    Use the Pythagorean theorem: Pythagorean theorem - Wikipedia, the free encyclopedia

    Set up an expression for the length of each of the sides. Plug the expression into the Phthagorean equation. You know the length of the diagonal, so you can plug it into the theorem directly. Solve for the length of the width.
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