5. TBQ - Area of similar triangle

If \(\Delta ABC\) is similar to \(DEF\) such that \(BC = 7 \ cm\), \(EF = 3 \ cm\) and area of \(\Delta ABC = 343 \ cm^2\). Find the area of \(\Delta DEF\).
 
Answer:
 
The area of \(\Delta DEF =\) \(cm^2\).
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