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Construct a triangle similar to a given \( \triangle \dot{A} B C \) such that each of its sides is \( (2 / 3)^{n d} \) of the corresponding sides of \( \triangle A B C \). It is given that \( B C=6 \mathrm{~cm}, \angle B=50^{\circ} \) and \( \angle C=60^{\circ} \).
(iv)
\[
S \cdot F=\frac{2}{3}
\]
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