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Math Help - Prove question

  1. #1
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    Prove question

    The radius of circle ABC, centre B is r1.
    The radius of circle CDE, centre D is r2.

    For the diagram above PROVE that AC/CE = r1/r2

    :l
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  2. #2
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    Re: Prove question

    This is a picture
    Attached Thumbnails Attached Thumbnails Prove question-cirlc-radius.bmp  
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  3. #3
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    Re: Prove question

    Hint: There are some similar triangles in the diagram...
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  4. #4
    Senior Member jakncoke's Avatar
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    Re: Prove question

    How about this pic attached.  \frac{\sqrt(2)*r1}{\sqrt(2)*r2} = \frac{r1}{r2}
    Attached Thumbnails Attached Thumbnails Prove question-pic.png  
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  5. #5
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    Re: Prove question

    Jakncoke, I dont quite understand where and how you got those figures could you please explain?
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  6. #6
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    Re: Prove question

    @jakncoke, that's only a specific case (for right isosceles triangles). It does generalize, using similarity.
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  7. #7
    Senior Member jakncoke's Avatar
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    Re: Prove question

    yea my bad, i wasn't thinking.
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