В треугольнике авс угол с равен 90 градусов, АВ=5, sin A= 3/5. Найдите AC - №24328912

В треугольнике авс угол с равен 90 градусов, АВ=5, sin A= 3/5. Найдите AC
- Предмет:
  Математика
- Автор:
  dashawn5cgc
- 5 лет назад

Ответы 1

Угол C равен 90 гр - по условию.Sin A = AC/ AB = AC/5AC/5 = 3/5, значит AC = 3.
- Автор:
  veleriowang
- 5 лет назад
- 0
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The First Boomerang.
In the old times the sky was not as high above the Earth as it is today. It was down to the earth, so all the people and animals were very short and small. All the animals very unhappy: birds could not fly with their winds and kangaroos could not jump around. Only snakes liked it because they could hint the birds for their food.
It never rained. The trees were short and looked like yellow grass. The Earth was like a desert, with no seas or oceans.
At that time there lived a hinter. His name was Yondi. One day he was in the forest. He was very tired and could not walk any more. In the end Yondi saw a little lake. He liked it and wanted to spend some time there. It was nice to sit and watch animals. Yondi saw a very strange thing: when the animals came to the lake, they were ill and sad. But after drank from it, they became strong and healthy.
Yondi was puzzled. «What that? Why do they look so different? » he thought. But after a short time he understood, « This water works like magic, so it can help me, too. I must try. »
The hunter jumped into the lake. In the water he found a stick and took it in his hand. When he got out of the water, he was strong and healthy.
He looked around and understood that he was getting taller and taller. The stick was getting bigger and bigger, too. After some time Yondi hit his head against the sky.
«Oh, no! » he cried. «I am too tall new! I must push up the sky with this magic stick. »
So he took his stick and started to push up the sky higher and higher. He called his friends, animals, and they came to help him, too. Only the snakes did not want to work with them and to push up the sky. Do you know why?
Yondi because as tall as today people and pushed the sky up to the place where it is now. Together with the sky, the sun and the stars also went up.
The water from the magic lake went up to the sun and… it started raining! The magic water came down to the people, animal and trees and made them strong and healthy. They started getting biggest and taller. Small lakes became rivers, seas and oceans.
All the men and woman started dancing. They said « thank you » to the great hunter Yondi. His friends animals were happy, too. The kangaroo started jumping around and forgot how to walk. The birds learned to fly and sing beautiful songs.
Yondi looked at his magic stick and saw bent. «I do not need it, » he thought and threw the stick away, but it came back! That is how the first boomerang come to be.
1. What was the Earth like in the old times?
2. who was Yondi?
3. what surprised Yondi when he saw animals near the lake?
4. what did the magic water do to yondi?
5. why did he want to push up the sky?
6. what did the magic water do to people, animals and trees?
7.how did the people and animais celebrate?
8.how did the magic stick become a boomerang?
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