A) \[{{\text{r}}^{\text{2}}}\]
B) \[\text{2 }{{\text{r}}^{\text{2}}}\]
C) \[\text{4 }{{\text{r}}^{\text{2}}}\]
D) \[\pi \text{ }{{\text{r}}^{\text{2}}}\]
Correct Answer: B
Solution :
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