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6x = 180
x= 180/6 = 30
sdt terbesar = 3.30 = 90
2. 4x+10 + 5x -30 + 6x - 40 = 180
15x -60 = 180
15x = 180+60
x = 240/15 = 16
sdt A= 4.16 + 10 = 74
sdt B = 5.16 -30 = 50
sdt C = 6.16 - 40 = 56
sisi yg terpanjang = grs di dpn sudut terbesar
sdt terbesar adalah sdt A jd sisi terpanjang BC