SSC CGL 24 Aug 2021 Shift 3 Paper

Question : 71 of 100

Marks: +1, -0

The surface area of a cube is

13.5 {m}^{2}

. What is the length (in

{m}

) of its diagonal?

Solution:

Given, Surface area of cube

=13.5 {m}^{2}

We know that,
Surface area of cube

=6 a^{2}

\;6 a^{2} \;\; =13.5

⇒\;a^{2} \;\; =2.25

⇒\;a \;\; =√{2.25}=1.5

By formula's
Diagonal of cube

=a √{3}=1.5 √{3} {m}

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