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How in this situation (presented in image) can I prove that $|CA|+|CB|=2|AB|$?

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    Is $\Delta ABC$ equilateral?2012-11-01
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    We don't know if it is equilateral.2012-11-01
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    So maybe if we can't proove that a=b, can we proove that |CB|+|CA|=2|AB|? If yes, how?2012-11-01
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    If someone had find topic with this question it would be really nice to post a link here.2012-11-01
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    Does anybody has a link for the topic with this question? I've heard it was discussed on this forum, but I can not find it here.2012-11-02

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