HURRY IM ON A TIME LIMIT WILL MARK YOU BRAINLIEST

45°

Step-by-step explanation:

Since WXYZ is a square, all of it's sides are equal. This means that triangle XYZ is an isosceles triangle (with two sides being equal), so ∠ZXY and ∠XZY are equal. ∠XYZ is right angle because it is in the corner of the square.

180 - 90 = 90

90/2 = 45

All I did was subtract ∠XYZ from 180° (which is the sum of every angle in a triangle), then divide that by 2 (because ∠ZXY and ∠XZY are equal).