I have NO IDEA how to do these:

1. What is the value of the missing angle?
A:50
B:60
C:100
D:240

2. What is the value of the missing angle?
A:129
B:153
C:169
D:720

I have NO IDEA how to do these 1 What is the value of the missing angle A50 B60 C100 D240 2 What is the value of the missing angle A129 B153 C169 D720 class=
I have NO IDEA how to do these 1 What is the value of the missing angle A50 B60 C100 D240 2 What is the value of the missing angle A129 B153 C169 D720 class=