Answer:
141
Step-by-step explanation:
<1 and the angle measuring 39 degrees form a straight lines so they sum to 180 degrees.
<1 +39 = 180
Subtract 39 from each side
<1 +39-39 = 180-39
<1 = 141
141 degrees
Angle 1 is on the straight line with 39 degree angle together would = 180
180 - 39 = 141 degrees
