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Math Help - similar triangles...

  1. #1
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    similar triangles...

    ok im not sure why i keep getting the answer an 3 to this problem, im hoping someone can show me where im going wrong....

    ok so here goes...

    we have a triangle ABC, where AB = 6 and AD = 3. what is the length of CD?
    before i go on, BD is a perpendicular bisector to AC.

    so anyways i found the length of BD to be 5. now im not sure where to go from here...i tried to use triangles ABD and BDC but this isnt right...
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  2. #2
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    Re: similar triangles...

    How did you get BD = 5?
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  3. #3
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    Re: similar triangles...

    ok in the triangle ABD, AB is 6 and the hypotenuse side where AD is the base and equal to 3, so i used Pythagorean theorem to solve for BD which is the height of the triangle
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  4. #4
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    Re: similar triangles...

    Or \sqrt{27} to be exact, as BD is a perpendicular bisector then DC = AD, this should help.
    Last edited by pickslides; October 6th 2011 at 07:07 PM. Reason: bad grammar, dam Friday!
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