Предмет: Геометрия, автор: Настенька9999999999

Помогите пожалуйста)

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Автор ответа: pryhodzichdavid
1

2)

вектор АВ-AD=DB

DB=10 см

АВ-AD=10 см

pryhodzichdavid: я толко 3 не понял..
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