Question

the edge of a cube is 5 cm its diagonal will be

Answer 1

the diagonal of this cube will be
$5\sqrt{2}$
because when a diagonal is made in the cube it will look like a sum of two opposite right angled triangles.
and then we use pythagoras theorm here

let,the length of diagonal = X
acc. to ques.
x square = 5 square + 5 square
x square = 25 +25
x square = 50
x = under root 50
x = 5 under root 2