A) 800 \[c{{m}^{2}}\]
B) 810 \[c{{m}^{2}}\]
C) 820 \[c{{m}^{2}}\]
D) 830 \[c{{m}^{2}}\]
Correct Answer: B
Solution :
(b): As we know, surface area \[=6{{a}^{2}}\] Two cubes joined \[\Rightarrow \]Total surface area \[=2\times 6{{a}^{2}}-\] surface area of two cubes at joints \[\Rightarrow 12{{a}^{2}}-2\times {{a}^{2}}=10{{a}^{2}}=10\times {{9}^{2}}=810.\]
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