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segitiga sama kaki
Sudut ABO = sudut BAO
20° = 20°
Sudut BAO + sudut CAO = sudut BAC
20° + 20° = 40°
Sudut BAC = 2 sudut BOC
40° = 2 (40°)
= 80°
Segitiga BOC = segitiga sama kaki
180 - 80 = 100 : 2 = 50°
Sudut BCO = sudut CBO = 50°
Ditanya sudut ACB ?
= sudut BCO + sudut ACO
= 50° + 20° = 70°