Answer:
x = 110
Step-by-step explanation
The sum of the interior angles of a quadrilateral = 360°
Sum the given angles and equate to 360
82 + 40 + 128 + x = 360
250 + x = 360 ( subtract 250 from both sides )
x=110°
Explanation:
Sum of angles in a quadrilateral = 360°
360° - 128° - 40° - 82° = 110°
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