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Ответ

Ответ дан
krisbina05

abc-трикутник

b-70

c-30

розв'язання

b+c

70+30=100

180-100=80

Ответ

Ответ дан
akumyrarin

Кут А =80° .Бо заважаючи на малюнок 180° - 70° - 30°= 80° . Сума всіх кутів в трикутнику =180°

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