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3x + 45 + 2x + 15 = 180°
5x + 60 = 180°
5x = 180-60
5x = 120
x = 120 ÷ 5
x = 24
3x + 45
3(24) + 45
72 + 45 = 117
2x + 15
2(24) + 15
48 + 15 = 63
jadi besar sudut terbesar adalah 117°