A) \[21\,\,{{m}^{2}}\]
B) \[42\,\,{{m}^{2}}\]
C) \[54\,\,{{m}^{2}}\]
D) \[108\,\,{{m}^{2}}\]
Correct Answer: C
Solution :
\[P=18\,\,m\], Area of four walls\[=2(l+b)\times h=18\times 3=54\,\,c{{m}^{2}}\]
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