площадь круга 225п см/квадрат. площадь сектора 75п см/квадрат. Нади градус центрального - №24947858

площадь круга 225п см/квадрат. площадь сектора 75п см/квадрат. Нади градус центрального угла.
- Предмет:
  Математика
- Автор:
  shaggylucero
- 5 лет назад

Ответы 1

S=πR²=225;Sₐ=α*πR²/360°=75π;α=120°.
- Автор:
  commando
- 5 лет назад
- 0
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Transportation used to be much slower than it is now.
For many years in desert, camels used to be the only form of transportation. Before the age of modern trains, camel trains used to carry all the goods for trading between Central Africa and Europe. Traders sometimes used to put together camel trains with 10,000 to 15,000 animals. Each animal often carried as much as 400 pounds and it could travel twenty miles a day. This form of transportation used to be so important that camels were called the "ships of the desert".
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Air travels has changed too. The earliest planes were biplanes, with two sets of wings. The top speed of this plane was 60 miles per hour. The pilots used to sit or lie on the wings in the open air. The plane engines sometimes used to stop in the middle of a trip. It was impossible to fly in bad weather. In snow or rain, the wings frequently became icy. Then the plane might go down.
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