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b) <ACB= 180° - 150° = 30°
c) <A1= 180° - 103° = 77°
d) <A2= 180° - (77° + 30°) = 73°
e) <A3 = 180° - 150° = 30°
4) a) <BAC = (180° - 42°)/2 = 69°
b) <CBD = 180° - 69° = 111°