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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and and . Can you go on from here?

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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