Предмет: Геометрия, автор: evgenijgorpyncenko

вибачте за каліграфію швидко писав.

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Автор ответа: olgaua64

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Пояснення:

за першою ознакою рівності трикутників, дві сторони і кут між ними, як вертикальний кут О, трикутники ВОА та ДОС рівні. Тому рівні і відповідні кути. <ОСА=<ОАВ. А так як це внутрішні різносторонні кути між прямими ВА, СД та січною СА і вони рівні, то

АВ||СД

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