Предмет: Математика, автор: aleshenkastepa

Внешний угол при вершине равнобедренного треугольника равен 120°. Найдите площадь треугольника, если длина боковой стороны равна 2√3.

Ответы

Автор ответа: Аноним

Внешний угол при вершине равнобедренного треугольника равен 120°, тогда внутренний равен 180°-120°=60°.

У равнобедренного треугольника углы при основании равны, значит все углы треугольника по 60°, откуда имеем равносторонний треугольник и стороны у равностороннего треугольника равны.

Площадь треугольника

S = a²*sqrt(3)/4=12*sqrt(3)/4=3sqrt(3)

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Read the text "Shops in Britain".
In all big cities of Great Britain there are a lot of department stores. They are big shops where you can find almost everything you want and which offer a wide choice of things. The most famous British department store, Harrods, started as a small grocery shop in 1849. The present store has more than 300 departments and a staff of over 4,000 people. The display in the food hall is amazing. For example, there is a choice of over 500 types of cheese.

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In the centre of most towns and villages there is a main street with lots of different shops. This street is usually called the High Street. The high streets of Britain are beginning to look more and more the same. This is because they are full of branches of big chain stores.

One of the best-known chain stores is Marks & Spencer, which sells clothes and food. The company has over 700 stores worldwide and has a reputation for good quality. If you buy something that you decide you don’t like, you can take it back and get your money back.

Some towns are called market towns: a market is held there, usually once a week. People come from the surrounding villages to do shopping there.

Eighty-seven per cent of British people live less than a mile from their local corner shop. A corner shop is a small shop on, or near, a street corner. Only in corner shops do shopkeepers know their customers personally. Only in them is the interaction across the counter often social as well as transactional. Many corner shops are run by Indian or Pakistan families. Most corner shops sell food and newspapers. They are open until late in the evening, as well as on Sundays.

However, many small high-street and corner shops are closing because people prefer to drive to a shopping complex outside town. There they can park their cars without any problems and do all the shopping in one place.

In a British shopping complex you usually find a supermarket, a branch of most of the chain stores, some smaller shops, a few cafes and sometimes a multiscreen cinema. Most of the new shopping complexes are built near big roads, outside town.

Here you also find “superstores”. These enormous shops sell their products more cheaply than in the high-street shops. Many of the superstores are branches of chain stores from countries outside Britain, such as IKEA or Aldi. However, this trend has not gone as far as it has in some other European countries.

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Write four words into each gap.
1. The high streets of Britain are ... and more the same.
2. Only in them is the ... often social as well as transactional.
3. However, this ... as far as it has in some other European countries.

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