Answered

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if the sum of 3 exterior angles of a quadrilateral is 256, find the measure of the 4th exterior angle and its adjacent angle.

Sagot :

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