In the given diagram, ∠4 = 45°, ∠5 = 135°, and ∠10 = ∠11.

part a: solve for the values of the remaining angles. show all of your work for full credit.

part b: use complete sentences to describe the angle relationship between the following angle pairs:
1. ∠4 and ∠1
2. ∠7 and ∠5
3. ∠9 and ∠10