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The sum of all the exterior angles is 360 degrees..
since it is quadrilateral and the measurement for the 3 ext angles is given as 256 then you'll have the angle for the 4th as 
4th exterior angle = 360-256
                          = 104 degrees

Remember that when you are to extend you'll have a 180-degree angle therefore the adjacent angle will be 
adjacent angle = 180 - 104
                      = 76 degrees
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