Answers:
1.
1 and 4
3 and 2
3.
BCA and ECD
BCE and ACD
Step-by-step explanation:
In the following figure, the green angles are vertical angles and the red angles are also vertical angles.
These angles are formed when two lines cross and they are opposite and have the same measure.
Therefore, in the first figure, the vertical angles are:
1 and 4
3 and 2
In the same way, in the second figure, the vertical angles are:
BCA and ECD
BCE and ACD
BCA is the angle formed by points B, C, and A. You can see it more clear in the following figure:
BCA is the green angle because you can form the angle using the line that goes from B to C and the line that goes from C to A.