From a thin metallic piece, in the shape of a trapezium in which PQ \( \| \mathrm{RS} \) and \( ...

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From a thin metallic piece, in the shape of a trapezium in which PQ \( \| \mathrm{RS} \) and \( \angle \mathrm{QRS}=90^{\circ} \), a quarter-circle \( \mathrm{QFER} \) is removed (see figure). Given \( \mathrm{PQ}=\mathrm{QR}=3.5 \mathrm{~cm} \) and \( \mathrm{SE}=2 \mathrm{~cm} \), calculate the area of the remaining (shaded) part of the metal sheet (use \( \pi=\frac{22}{7} \) )
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