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Fiodorov Andrei · Answer 1 · 2021-12-21T19:00:04+0000

Answer:

Angle 13 is 106, by the supplementary angle theorem.

Explanation:

Supplementary angles add up to 180 degrees when they lie on a straight line.

Angle 13 + Angle 12 = 180

Angle 13 + 74 = 180

Angle 13 = 106