90 degrees
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The sum of all four interior angles in a quadrilateral must be 360, so the answer would be: 360 - 54 - 25 - 99 = 182
80 The angles in a quadrilateral add up to 360 degrees. So if 3 angles = 280 the fourth angle is 360-280 = 80
It is: 360-80-120-65 = 95 degrees which is the 4th angle
360
83 degree angle