определите, является ли треугольник ABC прямоугольным , если два его внешних угла равны 125 и 145 градусов

 

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Вставить артикль,где необходимо, 1.I am _ doctor.I work at _ hospital._hospital is large. 2.You have two _ books.Give me one _ book,please. 3.Are you _pupil?No, I am _ student. 4.Is he _good pupil? 5,My friend bought _interesting _book last week. 6.He has _daughter ,but he has no _son. 7.My father is sitting at _table.He is writing _letter._letter is long. 8.His brother has _cat._cat is old and _fat. 9.It is very dark in _street. 10.I am at_home.I am reading_interesting book.