In Exercises 19-22, are AC and DF parallel? Explain
your reasoning.
19.
21.
A
57° B
D
D
123⁰
E
CF
62⁰
A B 62°
E
с
F
20.
22.
A B
D
A
143⁰
D
37°
65°
E
115°
E
с
B C
65°
F