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Sudut 2 = 90
Sudut 3 = 50
Sudut 4 = 180 - 50 (sepihak)
Sudut 4 = 130
b) Sudut 1 = 180 - 135 (sepihak)
Sudut 1 = 45
Sudut 2 = 180 - 70 (sepihak)
Sudut 2 = 110
Sudut 3 = 70
Sudut 4 = 135