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Вопрос по геометрии:
Около треугольника ABC описана окружность с центром в точке O. Если ∠AOB=60°, ∠AOC=140°, то определите местоположение центра O.-
Автор:
lynn
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Точка О лежит внутри треугольника,если у треугольника все углы острые.А у Вас условие такое,что треугольник имеет тупой угол АВС,
Ответ:
Центр окружности, описанной около тупоугольного треугольника, лежит вне треугольника (напротив тупого угла, за большей стороной).
Объяснение:
Проведём радиусы ОА и ОС так,чтобы угол между ними был равен 140°.Проведём радиус ОВ так,чтоы угол с радиусом ОА 60° .Соединим точки А и С ,получим тупоугольный треугольник АОС и тупоугольный треугольник АВС .
Центр окружности, описанной около тупоугольного треугольника, лежит вне треугольника (напротив тупого угла В , за большей стороной АС).
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Вопрос по английскому языку:
V. Read this information for visitors to Japan. Match the headings (1–7) with the paragraphs (a–g):
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Doing Business In Japan
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VI. Find the words in the text which mean:
1) a list of things that will happen or be discussed and dealt with at a meeting
2) to bend your head or the top part of your body forward and down, as a sign of respect
3) before a particular time
4) someone who organizes an event and invites the guests
5) to put your arms around somebody, especially to show that you love him/her
6) the feeling that you have when you admire or have a high opinion of somebody
7) objects made from gold, silver, and valuable stones that you wear for decoration
VII. Find the words in the text which are opposite to:
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