The relationship of the given angles are:
1. A. Adjacent 
2. B. vertical 
3. B. vertical 
4. E. linear pair
5. C. complementary
6. D. supplementary 
7. C. complementary
8. A. adjacent 
9. A. adjacent 
10. D. supplementary 
11. A. adjacent 
12. C. complementary.
<h3>How to Determine the Relationship Between Angles?</h3>
Different pairs of angles are related to each other in several ways. The explanation below shows the relationship between the given angles.
1. Angles 2 and 3 share a common vertex and a common side, therefore:
<2 and <3 are: A> Adjacent 
2. <3 and <4 are non-adjacent angles that share a common vertex and are opposite each other. Thus:
<3 and <4 are: B. vertical 
3. <1 and <3 are: B. vertical 
4. <1 and <2 lie on a straight line and are adjacent to each other. Therefore, they are a: linear pair
5. 78 + 12 = 90 degrees. Therefore, their relationship is that they are: C. complementary
6. 123 + 57 = 180. Therefore, they are: D. supplementary 
7. Angles a and b form a right angle. Therefore, they are: C. complementary
8. <1 and <2 are: adjacent 
9. <3 and <4 are: A. adjacent 
10. 90 + 90 = 180, therefore, the angles are: D. supplementary 
11. Both angles are: A. adjacent 
12. 40 + 50 = 90 degrees. Therefore, the angles are: C. complementary.
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