Answer:
39 degrees.
Explanation:
the line is 180 degrees. one of the angles is 51 degrees and another is 90 degrees because it shows us a square. 51 + 90 is 141. 180 - 141 is 39. so 39 degrees is your answer.
c + 51° + 90° = 180°
c + 141° = 180°
c = 180° - 141°
c = 39°
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