\( \triangle A B C \) and \( \triangle D E F \) are similar and \( A B=\frac{1}{3} D E \), then ...

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\( \triangle A B C \) and \( \triangle D E F \) are similar and \( A B=\frac{1}{3} D E \), then find
(W) \( \operatorname{ar}(\triangle A B C): \operatorname{ar}(\triangle D E F) \).
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