The sum of the interior angles of a quadrilateral is 360 degrees.
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360 degrees are supposed to be in a quadrilateral so 360 - 270 = 90 degrees
The sum of the measures of the interior angles of any quadrilateral is 360.(S-2)*180 equals the sum.
Any 4 sided quadrilateral has 4 interior angles that add up to 360 degrees
Sum of angles in a quadrilateral is 360° Three angles sum to 80° + 120° + 65° = 265° Therefore the missing fourth angle is 360° - 265° = 95°