A) \[1.2\pi \,\,c{{m}^{2}}\]
B) \[12\pi \,\,c{{m}^{2}}\]
C) \[6\pi \,\,c{{m}^{2}}\]
D) None of these
Correct Answer: A
Solution :
We know that area of a circle is\[A=\pi {{R}^{2}}\] \[\therefore \frac{dA}{dt}=2\pi R\frac{dR}{dt}=1.2\pi c{{m}^{2}}\].
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