Answer:
55 degrees.
Step-by-step explanation:
We can use the postulate if two angles are congruent in both triangles than the triangle is congruent.
That means we can plug in 80 and 45 for triangle QRS.
Then, we can find angle 1 by subtracting the sum of those numbers from 180.
80 + 45 = 125
180 - 125 = 55
