A) \[398.75\text{ }c{{m}^{2}}\]
B) \[418\text{ }c{{m}^{2}}\]
C) \[444\text{ }c{{m}^{2}}\]
D) \[412\text{ }c{{m}^{2}}\]
Correct Answer: B
Solution :
(b): Radius of cylinder and hemispheres\[=\frac{7}{2}=3.5\,cm\] Height of cylinder \[=19-(3.5\times 2)=12\,\,cm\] Total surface area of solid \[=2\pi rh+4\pi {{r}^{2}}\] \[\Rightarrow \] \[2\times 3.14\times 3.5\times 12+4\times 3.14\times {{(3.5)}^{2}}\] \[\Rightarrow \] \[418\,\,c{{m}^{2}}\]
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