Предмет: Геометрия, автор: mant98213

Помогите пожалуйста 65 баллов дам

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Автор ответа: kchvanova007

Ответ:

1) внешний угол при вершине смежный с углом acb, отсюда следует, угол acb= 180 -162 =18° угол b = (180-18)/2 = 162 /2 = 81 °

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