В треугольнике ABC проведена высота CD к основанию AB. AD=2 BD=18. Найдите высоту CD

В треугольнике ABC проведена высота CD к основанию AB. AD=2 BD=18. Найдите высоту CD
- Предмет:
  Геометрия
- Автор:
  alan1vh2
- 6 лет назад

Ответы 1

Отношение прилежащего катета к гипотенузе есть косинусcos 30= бд/4 корня из 3корень из 3/2=бд/4 корня из 32бд=4 корня из 3*корень из 32бд=4*32бд=12бд=6площадь тр-ка равна произведению половины основания треугольника на его высоту, значит18=(6*ас) /26ас=36ас=6
- Автор:
  itsy
- 6 лет назад
- 0
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STATE EDUCATION IN BRITAIN

All state schools in Britain are free, and schools provide their pupils with books and equipment for their studies.
Nine million children attend 35.000 schools in Britain. Education is compulsory from 5 till 16 years. Parents can choose to send their children to a nursery school or a pre¬school playgroup to prepare them » the start of compulsory education. Children start primary school at 5 and continue until they are 11. Most children are taught together, boys and girls in the same class. At 11 most pupils go to secondary schools which accept a wide range of children from all backgrounds and religious and ethnic groups. Ninety per cent of secondary schools in England, Scotland and Wales are co-educational.
At 16 pupils take a national exam called "G.C.S.E." (General Certificate of Secondary Education) and then they can leave school if they wish. This is the end of compulsory education.
Some 16-year-olds continue their studies in the sixth form at school or at a sixth form college. The sixth form prepares pupils for a national exam called "A" level (advanced level) at 18. You need "A" level to enter a university. Other 16-year-olds choose to go to a college of further education to study for more practical (vocational) diplomas relating to the world of work, such as hairdressing, typing or mechanics.
Universities and colleges of higher education accept students with "A" levels from Students study for a degree which takes on average three years of full-time study. Most students graduate at 21 or 22 and are given their degree at a special graduation ceremony.

Questions:
What do state schools in Britain provide their pupils with?
What can parents choose?
When do children start primary school?
When do pupils take a national exam called GCSE?
What prepares pupils for a national exam called "A" level?
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Найдите площадь комнаты, если известно, что длина больше ширины на 0,8 м.
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В треугольнике ABC проведена высота CD к основанию AB. AD=2 BD=18. Найдите высоту CD

Ответы 1

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