Доказать что a и b параллельны.​

Question

Доказать что a и b параллельны.​

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Comments

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Answer 1

угол 1 = 47° (вертикальные)

133° + <1 = 133° + 47° = 180° (одност.)</p>

Если сумма односторонних углов равна 180°, то прямые параллельны

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Comments

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зачем

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