I can't see the image so I don't know if my answer is going to be wrong based on the image, so I apologize if that is the case!
If the question is excactly as you stated it (not in the attachment), the answer should be that a reflection over the x-axis doesn't affect the angles of a square. In fact, it doesn't change any properties about the square, except it's coordinates on the plane! A reflection only moves the square, and it doesn't affect anything else about it.
Hope this helps!
