Answer:
A
Step-by-step explanation:
2
6
3
8
0
5
4
9
+
1
External angle equals to the sum of opposite internal angles
z - 41° + z - 20° = z + 40°
2z - 61° = z + 40°
2z - z - 61° = 40°
z - 61° = 40
z = 40° + 61°
z = 101°
These opposite angles are called Vertical Angles.