Answer:
B. [tex] m \angle1 + m \angle3[/tex]
D. [tex]180\degree - m \angle6[/tex]
Step-by-step explanation:
By exterior angle theorem:
[tex]m \angle4 = m \angle1 + m \angle3[/tex]
[tex]m \angle4 = 180\degree - m \angle6[/tex]
