In the given figure, \( B E \perp A C . A D \) is any line from \( A \) to \( B C \) intersectin...

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In the given figure, \( B E \perp A C . A D \) is any line from \( A \) to \( B C \) intersecting \( B E \) at \( H . P, Q \) and \( R \) are mid-points of \( A H, A B \) and \( B C \) respectively, then prove that \( \angle P Q R=90^{\circ} \).
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