ΔABC and ΔDEF are similar and their areas be respectively 64 cm2 and 121 cm2. If EF = 15.4 cm, BC is:
ΔABC and ΔDEF are similar.
$$\frac{\triangle ABC}{\triangle DEF}= (\frac{BC}{EF})^2$$
$$\frac{64}{121}= (\frac{BC}{15.4})^2$$
BC= 11.2
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