What is the value of the missing angle?

Answer: 60 degrees
Step-by-step explanation:
Angle sum of a triangle: 180 degrees
70+50=120
180-120=60
Straight line: 180 degrees
180-60=60 degrees
Answer:
120
Step-by-step explanation:
Add all the inner angles, 70+50=120. 180-120 = 60. The angle is a supplementary angle, so 180-60 = 120.