+32
5 лет назад
Геометрия
1 - 4 классы
∡ABF = 80° - - - > ∡ABC = 180°-80° = 100°
∡BAC = ∡BCA = (180°-100°) / 2 = 40°
∡OAC = ∡OCA = 40°/2 = 20°
∡AOC = 180°-20°-20° = 140°
∡ABF = 80° - - - > ∡ABC = 180°-80° = 100°
∡BAC = ∡BCA = (180°-100°) / 2 = 40°
∡OAC = ∡OCA = 40°/2 = 20°
∡AOC = 180°-20°-20° = 140°