Answer: 80
Step-by-step explanation:
If you look at the top left and bottom right corner, you see that they are identical, so basically you would do the same to 80.
Well lets see...
Solution 1. The sum of angles of a quadrilateral is 360˚ 100˚+100˚+80˚=280 degrees 360˚-280˚=80˚.
Solution 2. Opposite angles on a parallelogram are equal so x=80˚.
HOPE THIS HELPED!!!!!!!!!!
