If they are the angles of a triangle then the missing angle is 116 degrees
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Subtract the two known angles from 180 degrees will give you the missing angle
39+25=64
To find the measure of an angle, you need to know the size of the entire angle and the other angles within the angle. Then, you subtract the smaller, known angles from the entire, large angle and you should get the measure of the missing angle.
fifty 39 + 25 = 64 39 - 25 = 14 64 - 14 = 50
39 is 25% of 156