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Math Help - similar triangles

  1. #1
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    similar triangles

    Hi,

    Could someone help me with this question? No matter what I do, I can't find the answer! I've posted on other forums, but no one has been able to figure it out.



    Thanks!
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  2. #2
    Super Member malaygoel's Avatar
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    Is XR||ZQ?
    Are the triangles to be proved congruent?
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  3. #3
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    Yes, XR||ZQ.
    The book didn't say the triangles are congruent... I don't think they are when you need to prove them similar.
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  4. #4
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    Similar Triangles

    Hello Satsue

    Welcome to Math Help Forum!
    Quote Originally Posted by Satsue View Post
    Hi,

    Could someone help me with this question? No matter what I do, I can't find the answer! I've posted on other forums, but no one has been able to figure it out.



    Thanks!
    I think the reason no-one has been able to prove it is that it just isnít true! In order to prove the triangles similar, you need to show that their angles are equal. They have the angle P in common, so thatís no problem. Then youíd need to show that \angle PYX =\angle PZY. Since \angle ZYX = \angle PZQ = 90^o, we can do this provided we can show that \angle QYZ = \angle QZY. In other words, that the triangle ZQY is isosceles, with ZQ = YQ.

    But it is perfectly possible to draw a diagram meeting all the given facts where ZQ is clearly not the same length as YQ Ė see the diagram I have attached.

    Incidentally, notice that the line ZR and the point R are completely irrelevant to this question. This makes me think that there might be some additional fact that you havenít told us about! Could you check to see whether youíve missed something?

    Grandad
    Attached Thumbnails Attached Thumbnails similar triangles-untitled.jpg  
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