In the given figure, \( P Q R \) is a right angled (IV triangle at \( P \). Find the area of sha...

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In the given figure, \( P Q R \) is a right angled
(IV triangle at \( P \). Find the area of shaded region, if \( P R=4 \mathrm{~cm}, R Q=5 \mathrm{~cm} \) and \( I \) is centre of incircle of \( \triangle P Q R \).
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