Предмет: Алгебра, автор: muhametsafinakamilla

На стороне АС треугольника АВС выбраны точки D и E так что отрезки АD и СЕ равны. Оказалось что углы ADB и ВЕС тоже равны.Докажи что треугольник АВС равнобедренный.​

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Автор ответа: dudibakytbekovich
1

Ответ:

Треугольники ADB и EBC равны.

Т.к. один из признаков равенства треугольников:

равны две стороны и угол между ними.

Раз эти треугольники равны, AB и BC равны, следовательно треугольник ABC - равнобедренный

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