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Sudut B = Sudut C = 180° - 124° = 56°
Sudut segitiga sama kaki yg atas = 180 - 2(56)=
180° - 112° = 68°
2x° = 180° - (56 + 68)° = 56°
x° = (56 ÷ 2)°
x = 28