A) 7 cm
B) 3.25 cm
C) 5.25 cm
D) 9 cm
Correct Answer: C
Solution :
[c] Surface area of sphere\[=4\pi {{r}^{2}}\] According to question,\[4{{\pi }^{2}}=346.5\] \[4\times \frac{22}{7}\times {{r}^{2}}=346.5\] \[{{r}^{2}}=\frac{346.5\times 7}{4\times 22}=27.5625\] \[r=\sqrt{27.5625;}\,\,r=5.25\] |
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