For this question you must know about 45 45 90 triangles and 30 60 90 triangles and their special properties first you have to find the hypotenuse of the 45 45 90 triangles which is always square root of two times a leg in this case 10. so now you have 10squareroot2 the longer leg is sqare root 3 times the shorter leg in a 30 60 90 triangle
x=10squareroot6
and y is 2 2 times larger than the shorter side
y=20squareroot3