The radius of semi-circle is decreasing at the rate of \( \mathrm{P...

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The radius of semi-circle is decreasing at the rate of
\( \mathrm{P} \)
\( 7 \mathrm{~cm} / \mathrm{sec} \). Find the rate at which area is decreasing at
W
\( r=\frac{1}{\pi} \mathrm{cm} \).
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