Меньшее основание равнобокой трапеции равно 15 см, а высота 3 корней из 3 см.Найдите площадь трапеции,если один из её углов равен 150градусов

Меньшее основание равнобокой трапеции равно 15 см, а высота 3 корней из 3 см.Найдите площадь трапеции,если один из её углов равен 150градусов
- Предмет:
  Геометрия
- Автор:
  zaire
- 6 лет назад

Ответы 1

Дано: BC=15см, ∠B=150°, BH = 3√3см. Найти:S - ?Решение:∠A= 180° - 150° = 30°ctg ∠A = $\frac{AH}{BH}$ AH = BH·ctg ∠A = 3√3·ctg 30° = 3√3·√3 = 9 смAD = BC + 2·AH = 15 + 2·9 = 15 + 18 = 33 смS = $\frac{1}{2}$ ·BH ·(AD + BC) = $\frac{33+15}{2}$ ·3√3=72√3см²Ответ: 72√3 см².
- Автор:
  turkeyznr2
- 6 лет назад
- 0
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Задание по английскому языку из учебника Why Japan Is Cool. Нужно по тексту ответить на вопросы

Why Japan Is Cool
Each year more and more people gel interested in Japan and visit it. Japan is a country with longstanding traditions and ancient culture.
Japan’s name means “origin of the sun” which is often translated as Land of the Rising Sun. The term appeared due to Japan’s location to the east of the ancient empire of China. The country is situated to the east from the Asian continent and is surrounded by the ocean from different directions. It consists of many mountainous islands with active volcanoes. Of the four main islands, Honshu is the largest. The islands constitute 95% of Japan’s total territory while the remaining part is occupied by more than 3,000 smaller islands. The total land area of Japan is 374,744 square kilometres. All of these islands are likely to suffer from earthquakes.
After a long but comfortable flight the plane lands at the airport of Tokyo. Tokyo is a city tied to the future as it is to the past. As the modern-day capital of Japan it is the national centre of government, education and finance, and home to 12 million residents. Museums and restaurants, shopping centres and modem concert halls — you can find it all beneath the neon lights of this pulsating modern metropolis. It is also an ultra-urban city. Here you can find cutting-edge or innovative and pioneering fashion, a lot of experimental music, the latest gadgets from minicomputers that you can easily put into your pocket to super hi-tech mobile phones with digital cameras. All this attracts a lot of young people to the place.
Tourists usually recall their travels over Japan with enthusiasm, saying that it is really a unique and unforgettable country.

1) Japan is becoming ....
a) very popular among young tourists as the place to visit
b) one of the most dynamic places of the world
c) the largest economy in Asia
d) the leading economy of the world
2) The name of the country ....
a) was explained in China
b) was bom in China
c) was translated from Chinese
d) came into being thanks to its position referring to China
3) Volcano eruptions —
a) arc possible in Japan
b) threaten 95% of Japan’s total territory
c) never happen on 3,000 smaller Japanese islands
d) arc not a habitual thing in Japan
4) Tokyo is ....
a) a multinational city
b) a city where the history of the country is connected with new tendencies
c) a city of progressive ideas
d) a city full of secrets
5) The capital of Japan is ....
a) the place where you can find the country’s historical heritage
b) not the place to use old-fashioned gadgets and computers
c) the place where the first minicomputers were produced
d) the place to use your digital cameras
6) Tourists to Japan ....
a) may get acquainted with Japanese art and literature
b) must visit the National Parks of the country
c) practically always remember their visits to the country quite positively
d) tend to spend at least a day or two in its capital
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Меньшее основание равнобокой трапеции равно 15 см, а высота 3 корней из 3 см.Найдите площадь трапеции,если один из её углов равен 150градусов

Ответы 1

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