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[Label1]
Caption=Прямые АВ и CD пересекаются в точке Е. ~~Исследуйте случай,  когда три из четырех~~углов, полученных при пересечении прямых, будут равны.~~Сформулируйте гипотезу.~~~~~~~~
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[Label2]
Caption=Угол AEC = [Angle(A,E,C)°]°~~Угол CEB = [Angle(C,E,B)°]°~~Угол BED = [Angle(B,E,D)°]°~~Угол AED = [Angle(A,E,D)°]°~~
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