Answer:
8.49inches(incorrect options)
Explanation:
the diagonal in a square divided the square into 2 and equal right- angled triangles.
to find the length of the diagonal of the square pick one of the triangles and find the length using pythagoras theorem.
having sketch a diagram. the length of the diagonal becomes the hypotenuse and the the two sides of the square becomes the opposite and adjacent side.
hyp²=opp²+adj²
L²=6²+6²
L²=72
L=8.49inches