Answer:
ehhhh 5,3
Step-by-step explanation:
We know,
so
.....Hope this helps:)
Hello,
The sum of angles in a quadrilateral is 360°.
56,1° + 99,4° + 78,2° + x = 360°
233,7° + x = 360°
x = 360° - 233,7° = 126,3°
Bye :)