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ABD + ABC = 180° → ABC = 180° - ABD = 180° - 120° = 60°
b) Karena sudut ACB, ABC, dan BAC merupakan sudut pada segi tiga, maka :
ACB + ABC + BAC = 180° → ACB = 180° - (ABC + BAC) → ACB = 180° - (60° + 55°) = 65°
c) Karena sudut ACG dan ACB saling berpelurus, maka :
ACG + ACB = 180° → ACG = 180° - ACB = 180° - 65° = 115°
d) Karena sudut FCG dan ACB saling bertolak belakang, maka
FCG = ACB = 65°
Note : jangan lupa tambahin lambang " ∠"