Answer:
Step-by-step explanation:
In a parallelogram, sum of adjacent angles is 180
3x + 120 = 180
3x = 180 - 120
3x = 60 {Divide both sides by 3}
3x/3 = 60/3
x = 20
Answer: The value of x is 20.
-120 120
3x = 60
x= 20
3(20) = 60
