A) \[rC=2A\]
B) \[\frac{C}{A}=\frac{r}{2}\]
C) \[AC=\frac{{{r}^{2}}}{2}\]
D) \[\frac{A}{r}=C\]
Correct Answer: A
Solution :
(a): \[A=\pi {{r}^{2}};\,\,\,C=2\pi r\] \[\Rightarrow \,2A=2\pi {{r}^{2}}\Rightarrow \frac{2A}{r}=2\pi r=C\Rightarrow 2A=r\times C\]
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