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Math Help - geometry problem

  1. #1
    Newbie JoanneMac's Avatar
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    Exclamation geometry problem

    I know I'm going to seem like a real stoop, but this has me baffled because there are NO examples like it in my textbook.

    Here's the problem: Find the area of a rectangle with length 4 and diagonal 5.

    I know to find the area of a rectangle is A=bh, but don't know how to figure in the diagonal part!

    Any help is appreciated!!!!
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  2. #2
    Senior Member vincisonfire's Avatar
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    You must use Pythagore theorem that is  c^2 = a^2 + b^2 c is the diagonal.
    For more information on Pythagore theorem go on wikipedia.
     \sqrt{c^2 - a^2} = b = 3
    And you can do the rest as you told me.
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