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B. ACB
Jumlah sudut segitiga = 180°
60+55+x = 180
115+x = 180
x = 180 -115
x = 65
(x adalah sudut ACB)
C. ACB berpelurus dengan ACG
65+ACG = 180
ACG = 180 - 65
ACG = 115
D. FCG bertolak belakang dengan ACB
FCG = ACB
FCG = 65
maaf kalau salah