Given that ΔDEF ∽ ΔABC, if the area of ΔABC is 9 cm2 and that of ΔDEF = 12 cm2 and BC = 2.1 cm, then the length of EF is:
A. $$\frac{{8\sqrt 3 }}{5}{\text{ cm}}$$
B. $$\frac{{7\sqrt 3 }}{5}{\text{ cm}}$$
C. $$\frac{{4\sqrt 7 }}{5}{\text{ cm}}$$
D. $$\frac{{3\sqrt 7 }}{5}{\text{ cm}}$$
Answer: Option B
This Question Belongs to Arithmetic Ability >> Geometry
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