Answer: X =

Step-by-step explanation: Because the two angles are equal (You circled them, also 45 degs), and there is a right triangle, which means that the 90-degree angle's adjacent sides are equal, in this case, both sides equal to X.
Using the special triangle ratio ( 1, 1,
), in this case, the "2" is equal to
times
, so you have to divide the "1" (X) by
, you simply get
.
Sorry for my bad english