A) 16 cm
B) 8 cm
C) 4 cm
D) 2 cm
Correct Answer: B
Solution :
\[4\pi {{r}^{2}}=64\pi \,\,\text{sq}\,\,\text{cm}\] \[\Rightarrow \] \[{{r}^{2}}=16\] \[\Rightarrow \] \[r=4\,\,\text{cm}\] \[\therefore \] Diameter = 8 cm
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