Question

2. The length of each side of a cube is 7
cm, then the length of its diagonal is

please give the correct answer​

Answer 1

Answer:

Since all faces of a cube are right angled, to adjacent ones.

We apply Pythagorean-Theorem to find lengths of hypotenuse.

First, diagonals in each faces are equal to :

→  Then, diagonals in a cube will equal to :

→  The diagonal of a cube is √3 times the edge.

Therefore, Option C, 7√3 cm is the answer.