Correct Answer: Option D

Explanation

The formula for calculating the diagonal of a cuboid is given by : \(\sqrt{l^2 + w^2 + h^2}\)

where w = width, l = length and h = height

9 = \(\sqrt{l^2 + w^2 + h^2}\)

81 = 4\(^2\) + 4\(^2\) + h\(^2\) 

81 - 16 - 16 =  h\(^2\) 

h\(^2\)  = 49

h = \(\sqrt{49}\) = 7cm

NOTE:[l = w = 4 (square base)]

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