A) \[1386\,c{{m}^{2}}\]
B) \[2\pi \,(21)\]
C) \[\frac{\pi }{2}\,{{(21)}^{2}}\]
D) \[\frac{\pi }{4}\,{{(21)}^{2}}\]
Correct Answer: A
Solution :
[a] Area \[=\pi {{r}^{2}}=\frac{22}{7}\times 21\times 21=1386c{{m}^{2}}\]
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