Question

see question no 6 and answer

Answer 1

Sum of angles in a quadrilateral is 360 degrees
So
110+80+100+x=360
x=360-290 =70 degrees
Hope this helped you
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Answer 2

total of quidlirateral is 360
x = 4th angle
100+80+110=290
360-290=x
360-290=70
x=40
4th angle = 70
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