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В прямоугольном треугольнике ABC, AB равно 15 см один из катетов равен 9 .Найдите тангенс угла САВ- меньшего из острых углов.
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Предмет:
Алгебра -
Автор:
busterweaver - 5 лет назад
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Ответы 1
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Второй катет = √{15²-9²} = √144 = 12
Тангенс угла САВ = 9/12 = 3/4
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Автор:
leonor46 - 5 лет назад
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0
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Еще вопросы
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1. Задания для проверки умений в чтении с пониманием основного содержания
Mr. Lewis, who lived in a very quiet place, was on his way home from the railway station. It was very late, and he was alone on the dark road. Suddenly he heard a strange noise behind him. He realized somebody was there and he had an unpleasant feeling that the man following him. He began to walk faster. The man behind him began walking faster too. He walked slower, and the man moved slower too. He started running, but the man ran after him. Now Mr. Lewis was absolutely sure the man was following him and he was really frightened.
There was a wall on one side of the road, and he quickly climbed up on it and jumped down on the other side of the wall. «If he passes and does not stop, » Mr. Lewis thought, «everything will be all right. » But the man did not pass. He climbed up on the wall and jumped down, just as Mr. Lewis had done. Now Mr. Lewis was scared. His only thought was: «I am in danger! » Then he thought, «If he things I am a
coward, I’ll soon show him that he is making a mistake! » And he stood up and shouted, «What do you want? Why are you following me? »
The other man was so tired that at first it was difficult for him to speak. «I did not know that you are such an athlete, » he said at last. «I have to go to Mr. Stradlater’s house, but I don’t know the way. A man at the station told me that you live across the street from Mr. Stradlater, and he told me to follow you. Please, tell me: how long will it take us to get there? I don’t think I can go much farther – »
1) Выберете наиболее удачный заголовок для прочитанного рассказа.
А. Lonely Street
В. Two Cowards
С. Night Adventure
D.Dangerous.Meeting
2) Закончите предложение в соответствии с содержанием текста, выбрав правильный вариант из предложенных.
Mr. Lewis started running because…
… he was in a hurry.
… a big dog was following him.
… suddenly it started raining.
… he heard someone follow him
… running in the evening was good for him.
3) Объясните причину. Why did the man follow Mr. Lewis?
A. He recognized his old friend.
B. In order to find his friend’s house.
C. Because he felt uncomfortable in a dark street.
D. He hoped to be invited by Mr. Lewis.
E. In order to became a perfect runner.
4) Чему посвящён текст? The story is about …
A. … how bad it is to walk alone at night.
B.… poor lighting of the streets in some towns.
C. … how important it is to speak to other people on time.
D. …the cowards living in the small town.
E. …sport achievements of Mr. Lewis.
5) Оцените рассказ в целом.
a) terrible story, d) humorous story,
b) unrealistic story, e) tragic story.
c) love story,
6) Выберите пословицу, которая наиболее точно передаёт идею автора.
A. A friend in need is a friend indeed.
B. First think, then speak.
C. All is well that ends well.
D. A good beginning makes a good ending.
E. Out of sight, out of mind. заранее спасибо-
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2x^2+1,7x=0
0,04x^2-1=0
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Синквейн прилагательное
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5. Вычисли. Выполни проверку.
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