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sudut B = 3x
sudut C = 4x
jumlah sudut segitiga adalah 180°
jadi 2x + 3x + 4x = 180°
9x = 180°
x = 20°
Jadi
Sudut A = 2x = 2(20) = 40°
Sudut B = 3x = 3(20) = 60°
Sudut C = 4x = 4(20) = 80°
SELESAI