Line a is parallel to line b. A transversal c intersects a at P and b at Q. The angle at P that lies between the two lines and on the right of the transversal measures 123.6∘.
a. (i) Identify the angle at Q that forms an alternate interior angle pair with the given 123.6∘ angle.
b. (ii) Calculate the measure of the angle at Q, showing all steps.