A) \[700\,\,c{{m}^{2}}\]
B) \[720\,\,c{{m}^{2}}\]
C) \[750\,\,c{{m}^{2}}\]
D) \[770\,\,c{{m}^{2}}\]
Correct Answer: D
Solution :
[d] \[2\pi {{R}_{1}}=88\] \[2\pi {{R}_{2}}=132\] \[{{R}_{1}}=\frac{88\times 7}{44}=14\,cm\] \[{{R}_{2}}=\frac{132\times 7}{44}=21\,cm\] Area of Ring\[=\pi \left( {{21}^{2}}-{{14}^{2}} \right)\] \[=\frac{22}{7}\times 245\] \[=770\,c{{m}^{2}}\]
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