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$If l = b = h, then the diagonal of a cuboid is$

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$3 l$

$3 b$

All

$l 2 + b 2 + h 2$

answer is D.

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Detailed Solution

$l = b = h$

then diagonal of cuboid

$= 3 l$

$= l 2 + b 2 + h 2 = 3 b$

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