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Step 1let radies be ' \gamma '\frac{d r}{d t}=3 \text { fots }let Area be 'A' of rifule\begin{array}{l}\frac{\partial A}{\partial t}=? \\t=\operatorname{logec} \\A=\pi r^{2}\end{array}Diff unt\frac{d A}{d t}=\pi \cdot 2 r \frac{d r}{d t}Pritialat t=0, \quad \gamma=0\text { At } \begin{aligned}t & =10 \mathrm{sec}, \\r & =3 \times 10=30 \mathrm{ft}\end{aligned}Step 2At t=10 \mathrm{sec},\begin{array}{l} r=3 \times 10=30 \mathrm{ft} \\\frac{d A}{d t}=\pi \times 2 \times 30 \times 3 \\=180 \pi \mathrm{H} / \mathrm{sec}^{2} \\180 \pi\end{array} ...