Answer:
Explanation:
the adjacent angles are congruent
angle 1 = 51°
the sum of the angles is 360°
51 · 2 + 2 · angle (2) = 360
102 + 2angle(2) = 360
2angle (2) = 360 - 102
2 angle (2) = 258
angle (2) = 258/2
angle (2) = 129°
angle (3) = 129°
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