A) \[4h\]
B) \[6h\]
C) \[2\sqrt{7}h\]
D) \[4\sqrt{7}h\]
Correct Answer: C
Solution :
Let the height of the cuboid be h. Then, its width \[=2\,h\]and its length \[=4\,h\] \[\therefore \] Total surface area \[=2(4h\times 2h+4h\times h\times h\times 2h)\] \[=28\,{{h}^{2}}\] ?..(i) Let the side of the square be x. Then, its area \[={{x}^{2}}\] ??(ii) From equations (i) and (ii) \[{{x}^{2}}=28\,{{h}^{2}}\] or \[x=2\,\sqrt{7}\,h\]
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