\( \triangle A B C \) and \( \triangle D E F \) are similar. Area of \( \triangle A B C \) is \(...

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\( \triangle A B C \) and \( \triangle D E F \) are similar. Area of \( \triangle A B C \) is \( 9 \mathrm{~cm}^{2} \) and area of \( \triangle D E F \) is \( 64 \mathrm{~cm}^{2} \). If \( D E=5.1 \mathrm{~cm} \), then
(V) find the value of \( A B \).
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