Final answer:
In a parallelogram, corresponding angles are congruent.
Step-by-step explanation:
In this question, we are given that PQRS is a parallelogram and S, P, and T are collinear. We need to prove that angle 1 is congruent to angle 4.
Since PQRS is a parallelogram and S, P, and T are collinear, we can conclude that angle 1 and angle 4 are corresponding angles. Corresponding angles in a parallelogram are congruent.
Therefore, we can conclude that angle 1 is congruent to angle 4.