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Math Help - similiarities

  1. #1
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    Question similiarities

    Equilateral triangle abc is similar to the equilateral triangle fdr with the ratio of similarity 13. Which is equivalent to 3ab+5bc
    6fd+7dr?
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  2. #2
    MHF Contributor red_dog's Avatar
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    AB=BC and FD=DR and \frac{AB}{FD}=13.
    Can you go on from here?
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  3. #3
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    Question still need help

    Ok but i thoought that looked like i would take 13 times the number in the equation but I am not coming up with any of the answers given me. Could you help a little more please?
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  4. #4
    MHF Contributor red_dog's Avatar
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    \frac{3AB+5BC}{6FD+7DR}=\frac{3AB+5AB}{6FD+7FD}=\f  rac{8AB}{13FD}=\frac{8}{13}\cdot 13=8
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