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I don't understand this, plz help​

I don't understand this, plz help​-example-1
User Pardahlman
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1 Answer

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All triangles = 180 degree
Angle 1 + angle 2 + angle 3 = 180
44 + 79 + angle 3 = 180
123 + angle 3 = 180
Angle 3 = 57
User Senneco
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