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4x + 10 + 5x - 30 + 6x - 40 = 180
4x + 5x + 6x = 180 -10 + 30 + 40
15 x = 240
x = 240/15
x = 16
sudut A = 4x + 10 = 4(16) + 10 = 74
sudut B = 5x - 30 = 5(16) - 30 = 50
susut C = 6x - 40 = 6(16) - 40 = 56
sisi yg lebih panjang adalah sisi di depan sudut terbesar , sisi AB