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A = 4x + 10
B = 5x - 30
C = 6x - 40
A + B + C = 180
4x + 10 + 5x - 30 + 6x - 40 = 180
15 x = 180 + 40 + 30 - 10
15 x = 240
x = 16
A = 4(16) + 10 = 74
B = 5 (16) - 30 = 50
C = 6 (16) - 40 = 56
sisi terpanjang adalah di depan suduut terbesar
jadi yh terpanjanng adalah sisi BC