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∠ACB = 180° - 2 * 50° = 180° - 100° = 80°
∠DBC = 180° - 50° = 130°
ponieważ IBCI = IBDI to
∠BCD = ∠BDC = (180° - 130°) : 2 = 50° : 2 = 25°
∠ACD = 80° + 25° = 105°
∠BAC = 50°
odp kąty trójkata maja miary 25° , 50° , 105°