A) \[316\,\text{c}{{\text{m}}^{\text{3}}}\]
B) \[311\,\text{c}{{\text{m}}^{\text{3}}}\]
C) \[306.24\,\text{c}{{\text{m}}^{\text{3}}}\]
D) \[280.52\,\text{c}{{\text{m}}^{\text{3}}}\]
Correct Answer: C
Solution :
\[\because \] \[{{r}_{1}}=\frac{11.2}{2}cm=5.6\] and \[{{r}_{2}}=5.6+0.4=6\,cm\] and \[h=21\,cm\] \[\therefore \] Volume of metal \[=\pi (r_{2}^{2}-r_{1}^{2})h\] \[=\frac{22}{7}\times ({{6}^{2}}-{{(5.6)}^{2}})\times 21\] \[=\text{ }66\times (36-31.36)\] \[=66\times 4.64\] \[=306.24\,c{{m}^{3}}\]You need to login to perform this action.
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