Question : $\triangle$ABC is similar to $\triangle$DEF. If the area of $\triangle$ABC is 9 sq. cm and the area of $\triangle$DEF is 16 sq. cm and BC = 2.1 cm, then the length of EF will be:
Option 1: 5.6 cm
Option 2: 2.8 cm
Option 3: 3.7 cm
Option 4: 1.4 cm
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Correct Answer: 2.8 cm
Solution : Given: $\triangle$ABC is similar to $\triangle$DEF. So, $\frac{\text{Area of ABC}}{\text{Area of DEF}}=\frac{BC^2}{EF^2}$ ⇒ $\frac{9}{16}=\frac{2.1^2}{EF^2}$ ⇒ $EF^2=\frac{4.41×16}{9}$ ⇒ $EF=\sqrt{\frac{4.41×16}{9}}$ $\therefore EF =2.8$ cm Hence, the correct answer is 2.8 cm.
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