What is the diagonal of square who sides measure 7 square root of 3

X and x and x root 2, congruent sides we've got 2. 45 45 90

X 2x and x root 3 for the 30 60 90.

2 ways to solve:

Pythagorean theorem 7 root 3 squared + 7 root 3 squared = missing side.

Other way is to use the first hint
7 root 3= x. Diagonal= x root 2. Find the find the square root of 7 root of 3

13 , I think :)