радиус окружности с центром в точке о равен 75,длина хорды ав равна 90.найдите расстояние от хорды ав до параллельной ей касательной к

радиус окружности с центром в точке о равен 75,длина хорды ав равна 90.найдите расстояние от хорды ав до параллельной ей касательной к
- Предмет:
  Геометрия
- Автор:
  aurora
- 5 лет назад

Ответы 1

Проведем радиусы в точки A,B и K, обозначим тоску пересечения радиуса OK и хорды AB точкой DΔAOB равнобедренный (AO=OB=R) ⇒ OD - медиана ⇒ BD=1/2AB=45Из прямоугольного ΔDOB по т. Пифагора $OD= \sqrt{75^2-45^2}= \sqrt{3600}=60$ DK=75-60=15Ответ: 15
- Автор:
  allie13
- 5 лет назад
- 0
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Всем привет. Может кто поможет с переводом данного текста. :(
Many centuries ago king Uther and queen Igraine had a son named Arthur. He was born at Tintagel Castle. The king wanted to protect his son from attack by the Saxons. He decided to give Arthur to his wizard Merlin. Merlin sent Arthur away to the countryside. He grew up with Sir Ector and with his foster brother Kay. He never knew who his realy parents were.
Years later king Uther died. Nobody knew he had son. Everybody was arguing about who would be the new King of Britain. Suddenly a mysterious stone appeared in the churchyard of St Paul 's Cathedral in London. There was a message on the sword. It said "the person who pulls the sword from the stone is the King of Britain".
Everybody was excited. Lots of knights and princes tried to pull the sword out of the stone, but nobody was strong enough to do it. It was completely stuck. It was impossible to move the sword.
Years later, when Arthur was fifteen years old, his older brother Kay was learning to be a knight. He went to his first tournament in London. He was going to learn to use his sword. Arthur looked everywhere, but he couldn't find Kay's sword.
Arthur went to look for another sword. He went to St Paul 's Cathedral and in the churchyard he saw the sword in the stone. He tried to pull it out and it came out easily. He gave the sword to his brother. Everybody wanted to know who had pull the sword from the stone. At first no one believed what he had done. Everybody wanted know who had pulled the sword from the stone. At first, no one believed than Arthur had done it. Everybody was amazed. Final, Arthur became King Arthur, the new King of Britain.
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радиус окружности с центром в точке о равен 75,длина хорды ав равна 90.найдите расстояние от хорды ав до параллельной ей касательной к

Ответы 1

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