Предмет: Геометрия, автор: cherthebest

ABCD-параллелограмм,AE-биссектриса угла BAD,периметр параллелограмма равен 56 см,BE:EC=3:1.Найдите стороны параллелограмма.

Ответы

Автор ответа: Аноним

Биссектрисса параллелограмма отсекает равнобедренный треугольник АВЕ, АВ=ВЕ. Пусть х- коэффициент пропорциональности, тогда ВЕ=3х и ЕС=х, АВ=СD=BE=3x, BC=AD=4x, тогда:
2(3х+4х)=56
7х=28
х=4
Стороны: АВ=СD=12 , BC=AD=16

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Математика, автор: asylbekmeirambek

Помогите пожалуйста

6 лет назад

Предмет: Английский язык, автор: Аноним

Ответьте на вопросы после текста ( ответы должны быть по тексту! )

Moscow is the capital of Russia. It is one of the biggest and most beautiful cities in the world.
Moscow is a modern city now. The population of the city is about 15 million people. Moscow is a political center, where the government of our country works.
Moscow was founded in 1147 by Yuri Dolgoruky. The total area of Moscow is about 2 511 square kilometers.
We say that Moscow is a port of five seas, as the Moscow-Volga Canal links Moscow with the Baltic, White, Caspian and Black seas and the Sea of Azov.
Moscow is an industrial center too. There are many factories and plants in it. One of the best-known plants produces many Lorries and the other one produces cars.
Moscow is a cultural center. There are a lot of theatres, museums, institutes, libraries and cinemas in Moscow.
The Bolshoi Theatre is one of the famous theatres all over the world. If you are fond of painting you can go to the Tretyakov Art Gallery or to the Pushkin Fine Arts Museum and see a lot of interesting portraits and landscapes there. We say the Tretyakov Art Gallery is a treasure-house of Russian art.
Young people like to visit the Central Military Museum. There are many tanks, guns and war documents there.
One can see the Kremlin and Red Square in the city. There are many fine buildings, wide streets, green parks, large squares, churches and monuments in Moscow.
It is necessary to mention such famous monuments as monuments to the Great Russian writer Alexander Pushkin and to the first Russian printer Ivan Fedorov.
Visiting the capital a lot of foreigners from all over the world come to see these monuments.
One of the highest buildings in Moscow is the State Moscow University. It was founded in 1755 by the great scientist Mikhail Lomonosov.
Transport... Moscow is a very big city and its transport must be comfortable and fast.
One can see a lot of cars, buses, trolley-buses, trams in the streets of our city. The Moscow Metro began its work on the 15th of May, 1935. There were 13 stations at that time. Now it has 275 stations. Our metro is a beautiful and convenient one.
There are nine railway stations in Moscow and some airports around the city.
There are many stadiums in Moscow. The Central Stadium is in Luzhniki. Many competitions and football matches are held there.

Questions
1. What is the capital of Russia?

2. Moscow is a port of five seas, isn't it?

3. Is Moscow a modern city?

4. Are there many plants in Moscow?

5. Would you like to visit the Tretyakov Gallery?

6. How often do you go to the museums?

7. What do you know about the State Moscow University?

8. There are many kinds of transport in Moscow, aren't there?

9. How many stations has our metro got?

10. Do you like to go by metro?

6 лет назад

Предмет: Русский язык, автор: zidan80

315. Укажите несклоняемое существительное
A) смола B) мыло С) шило
D) сало E) трюмо

6 лет назад

Предмет: Биология, автор: andy1997

Где синтезируется витамин А у человека ?

9 лет назад

Предмет: Биология, автор: Аноним

Линей и Ламарк имели разные взгляды на понятие вид. В чем ошибочность взглядов, какие факторы говорят о реальном существовании видов и их изменчивости?

9 лет назад