Question

find the angle measure x in the following figure ​

Answer 1

Since, it is a quadrilateral.

We know

Sum of all angles is 360°

50° + 130° + 120° + x = 360°

x = 360° - 300

x = 60°

Answer 2

All angles =360
360 =50+130+120+x
360= 180+120+x
360=300+x
360-300=x
60=x