A) 243 sq cm
B) 463 sq cm
C) 486 sq cm
D) 293 sq cm
Correct Answer: A
Solution :
[a] Volume (new cube) \[=({{1}^{3}}+{{6}^{3}}+{{8}^{3}})=729\,c{{m}^{3}}\] \[{{a}^{3}}=729;a=9\,cm\] \[\therefore \]Surface area of the new cube \[=6{{a}^{2}}=486\,sq\,cm\] \[\frac{\text{surface}\,\text{area}}{2}=\frac{486}{2}=243\,sq\,cm\] |
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