Предмет: Геометрия, автор: nohopo880

помогите пожайлуста,задания на фото

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Ответы

Автор ответа: zmeura1204

1

Ответ:

3) CD=6см

4) А1С1=14см

Объяснение:

3)

При условии что плоскости параллельные

∆АВS~∆CSD, по углам

АВ/СD=BS/CS

3/СD=4/8

CD=8*3/4=6см

____________

4)

при условии что плоскость параллельна АС

АВ=А1В+АА1=3+7=10 частей.

∆А1ВС1~∆АВС, по углам

А1В/АВ=А1С1/АС

7/10=А1С1/20

А1С1=20*7/10=14см

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