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12x = 180-30
12x = 150
x = 150/12
x = 12,5
jadi, sudut C = 8x = 8.12,5 = 100˚
180 = A + B + C
180 = 4x + 30 + 8x
180 = 12x + 30
12x = 180 - 30
12x = 150
x = 12,5
Sudut C = 8x = 8(12,5) = 100