A) 10.5 cm
B) 9.5 cm
C) 10 cm
D) 9 cm
Correct Answer: D
Solution :
\[\frac{4}{3}\pi {{r}^{3}}=\frac{4}{3}\pi {{(1)}^{3}}+\frac{4}{3}\pi {{(6)}^{3}}+\frac{4}{3}\pi {{(8)}^{3}}\] \[\Rightarrow \] \[\frac{4}{3}\pi {{r}^{3}}=\frac{4}{3}\pi (1+216+512)\] \[\Rightarrow \] \[{{r}^{3}}=729\]\[\Rightarrow \]\[r=9\,\,\text{cm}\]You need to login to perform this action.
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