Предмет: Геометрия, автор: kseniaaaaa78

Номер 175, пожалуйста ❤️

Приложения:

Ответы

Автор ответа: sofiaplivachuk

Ответ:

решение:

Объяснение:

1. т.к. треугольники АВС и А1В1С1 равны, то угол ВСD и угол B1C1D1 равны - как соответственно равные элементы в равных треугольниках

2. докажем что треугольники DBC и D1B1C1 равны:

1) углы DBC и D1B1C1 равны - по усл.

2) BC = B1C1 - по усл. =>

3) углы BCD= B1C1D1

треугольники DBC=D1B1C1 по 2 признаку равенства треугольников

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