(13/7) to the power of 2 help?

The hypotenuse of a 45 -45 -90 triangle measure 7 square root 2 units

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

The number 72 lies between what perfect squares