A) \[2464{{m}^{2}}\]
B) \[{{42}^{o}}\]
C) \[13.2{{m}^{2}}\]
D) 30 unit
Correct Answer: C
Solution :
\[l=\frac{22\times 21\times 35}{3\times 7}=770m.\] \[=\frac{4}{3}\pi {{.4}^{3}}-\frac{4}{3}\pi {{.2}^{3}}=\frac{4}{3}\pi \times 56c{{m}^{3}}\].
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