Answer:
34°
Explanation:
consider the triangles YZX and WZX
YZ = WZ (given) 
YX = WX (given) 
XZ is common in both 
hence, triangle YZX & WZX are congrent to each other with the criteria SSS (side side side).
in triangle WQZ angle Q is 90° 
hence,
56° - angle WZQ = 90° 
=> 56° + x = 90° 
=> x = (90 - 56)° 
=> x = 34° 
=> angle WZQ = 34°
YZX congrent to WZX 
=> angle WZX = angle YZX = 34° 
Hence the value of angle YZX = 34°