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OpenStudy (anonymous):

ΔABC is similar to ΔDEF. The ratio of the perimeter of ΔABC to the perimeter of ΔDEF is 1 : 10. If the longest side of ΔDEF measures 40 units, what is the length of the longest side of ΔABC ?

OpenStudy (anonymous):

the answer is 4

jhonyy9 (jhonyy9):

so you write the ratio is 1/10 what mean 1 x --- = ---- 10 40 can you calculi x ? by cross multiplie and will get the right answer

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