Question
ΔΑΒC ~ ΔDEF and the perimeters of ΔABC and ΔDEF
are 40 cm and 12 cm, respectively. If DE = 6 cm, then AB is:Solution
∆ABC ~ ∆DEF  AB/DE = Perimeter of ∆ABC/Perimeter of ∆DEF x/6 = 40/12 x = (40/12) x 6  AB = 20 cm The length of AB is 20 cm. 
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