Reflection across y=x is a special case transformation

The original triangle has vertices A(-5,1), B(-4,3), C(-2,1), D(-3,-1) so the transformed triangle has vertices
A'(1,-5), B'(3,-4), C'(1,-2), D'(-1,-3)
Choice A'(1,-5)
180-140=40 (complementary angle)
2z=40
Z=40/2
Z=20
Answer:- 1) there are three terms
2) 3,4,1