The surface area of a cube is 13.5 m$$^2$$. What is the length (in m) of its diagonal?
Let the side of the cube = a
The surface area of a cube is 13.5 m$$^2$$.
6a$$^2$$ = 13.5
12a$$^2$$ = 27
a$$^2$$ = $$\frac{9}{4}$$
a = $$\frac{3}{2}$$
a = 1.5 m
Length of the diagonal of the cube = $$\sqrt{3}$$a
= 1.5$$\sqrt{3}$$ m
Hence, the correct answer is Option B
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