Question

A cube has side lengths of 1 unit. What is the length of a ‘body diagonal’?

Answer 1

The diagonal in a cube is $l \sqrt{3}$
Where l - is the length of the side.

So, in this case, the ‘body diagonal’ is $1 \sqrt{3} = \sqrt{3}$

Answer 2

side lenth=lenth of body diognal/root 3
for cube
ther 1=lenth of body diognal/root 3
therfor lenth o body diognal=root 3