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Math Help - Help with solving.

  1. #1
    Ash
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    Help with solving.

    What are the steps to solving this problem???
    The second problem was written wrong. It should have been, If CD= 15, what is the length of AE?
    I now understand how to do the first problem. But how do I apply it to solving the second one?
    I changed the image to shows the correct question.
    Last edited by Ash; December 8th 2006 at 01:16 PM. Reason: Changed to show correct problem.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Ash View Post
    What are the steps to solving these problems???
    Take the problem on the left.

    Triangles CBA and CED are similar since angle C is shared, angles CED and CBA are right, and angles EDC and BAC are equal.

    So \frac{BA}{ED} = \frac{BC}{BE}

    \frac{30}{10} = \frac{CE + 30}{CE}

    3 CE = CE + 30

    2 CE = 30

    CE = 15

    The second problem is supposed to be done using the same principle, but the diagram seems to conflict with the problem? (CD is the whole base, but 10 seems to be only a part of it?)

    -Dan
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  3. #3
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    Quote Originally Posted by topsquark View Post
    Take the problem on the left.

    Triangles CBA and CED are similar since angle C is shared, angles CED and CBA are right, and angles EDC and BAC are equal.

    So \frac{BA}{ED} = \frac{BC}{BE}

    \frac{30}{10} = \frac{CE + 30}{CE}

    3 CE = CE + 30

    2 CE = 30

    CE = 15

    The second problem is supposed to be done using the same principle, but the diagram seems to conflict with the problem? (CD is the whole base, but 10 seems to be only a part of it?)

    -Dan
    Indeed, as with the first I think he meant BA = 30, not BE.

    In the second, if DE = 10, then CD can't possibly be 10, so something is wrong.
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  4. #4
    Ash
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    Quote Originally Posted by AfterShock View Post
    Indeed, as with the first I think he meant BA = 30, not BE.

    In the second, if DE = 10, then CD can't possibly be 10, so something is wrong.
    On the second figure It was written wrong. It's suppose to be If CD=15 what is the length of AE?
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