### Home > CC4 > Chapter 3 > Lesson 3.3.3 > Problem 3-139

3-139.

*a*, *b*, *c*, and *d*. For each angle, name the relationship that helped justify your conclusion. For example, did you use vertical angles? If not, what type of angle did you use? Homework Help ✎

Review the Math Notes box in Lesson 1.2.1.