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Проведите прямую и постройте какую-нибудь окружность радиусом 3 см, для которой эта прямая является касательной.Сколько таких окружностей можно построить? Где расположены их центры ?
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Предмет:
Математика -
Автор:
shepherd - 5 лет назад
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Ответы 1
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Множество окружностей можно построить. Их центры расположены на одной прямой, которая параллельна касательной. примерно вот так: (фотка)
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Автор:
ember - 5 лет назад
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ПОМОГИТЕ ПЕРЕВЕСТИ ПОЖАЛУЙСТА
My name is Svetlana. I am 16 years old. I was born in Pyatigorsk, and still live here. My family is a small one. There are three of us in the family: my mother, my elder sister and me.
My mother is a manager of the firm. She is fond of her job. And in spite of the fact that, she is always busy she finds time to spend with us. We often spend evenings together. Sometimes we go to the cinema. I like films very much, and my favourite one is "Analyze that". It can seem strange, but I have seen it for many times and whenever I have a chance to watch it I don't miss it.
My sister's name is Natasha. She is already a student. She is 20. Natasha studies at the Institute of economy. I think she will become a good specialist. She studies a lot and she is an excellent student. I am so proud of her.
Natasha is tall and slim. But what I like most about her ap¬pearance are the dimples on her cheeks. She has long black curly hair. She is very pretty.
Well, as my mother works very hard and has a lot of things to do, my sister and I try to help her about the house. So we share our house chores. I usually tidy up the rooms and sometimes cook something to eat. Frankly speaking, I am not very good at cook¬ing, but my mother doesn't think so. Maybe she doesn't just tell me about it, because she doesn't want me to be disappointed. But I think that everything comes by experience. I am an optimist by nature.
Now let me tell you a little about my home. I think it doesn't matter what your home is like, anyway, it is the place where you once move in and start to furnish and decorate it to your own taste. It becomes your second "ego". So my second "ego" is not very big, but it is very comfortable. There is enough space for everything: a hall, a living-room, a couple of bedrooms and a bathroom.
Our living-room is very spacious. It is the heart of our apart¬ment. It is the place where I can see the rest of my family. In the evening we sit here in the soft armchairs and on the sofa, which are on the right of the room. In front of them there is furniture stuffed with crystal and books. There is also a stereo system and a TV set.
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Our hall is very big. There is a wardrobe, some book-shelves on the walls, a long rag on the floor, and a closet where we keep our shoes.
I like our home very much. Our building is quite close to the underground station and what is more important to my school.
As I am a sunny soul person by nature, I love to have fun, to laugh, to talk and I like people with a sense of humour as well. I think that humour is one of the most necessary things for people. It is such a feature of character that everyone of us must possess, because it helps us to live better, to survive, to go through our daily problems easier.
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