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12x + 12 = 180 derajat
12x = 168 derajat
x = 14 derajat
B. Sudut ACB = 180-(3x+30) = 150-3x
Sudut ABC = 180-(x+40) = 140-x
180 = 70+150-3x+140-x
180 = 360-4x
4x = 360-180
4x = 180
x = 45
Sudut BCA = ACB = 150 - 3x = 150 - 3.45 = 150 - 135 = 15 derajat