A) 104 sq m
B) 140 sq m
C) 170 sq m
D) 190 sq m
Correct Answer: D
Solution :
Given that, \[l=10\,m,\] \[b=5\,m,\] \[h=3\,m\] \[\therefore \] \[lb=10\times 5=50\,{{m}^{2}}\] \[bh=5\times 3=15\,{{m}^{2}}\] \[hl=10\times 3=30\,{{m}^{2}}\] \[\therefore \] Surface area \[=2(lb+bh+hl)\] \[=2(50+15+30)\] \[=2\times 95\] \[=190\,sq\,m\]
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