В треугольнике ABC угол A равен 90∘, tgB= √3/3 , AC=5. Найдите BC

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The United  States of America is the 4 th largest country in the world after Russia , Canada and China .It occupies the central part of the North American continent.The United States of America is a federal republic, consisting of 50 states including the states of Alaska and Hawaii.Outlying areas  include Puerto Rico , American Samoa , Guam, and the US Virgin Islands .

The northern boundary is partly formed by the Great Lakes and the St Lawrence River ; the southern boundary is partly formed  by the Rio Grande .United States also has a sea-border with Russia.

The total area of the United States ( including the District of Columbia) is9,809,155 sq km, of which 1,700,139 sq km are in Alaska and 28,313 are  in Hawaii.Inland waters cover 507,788 sq km of the total area.

The country is washed  by 3 oceans :the Atlantic , the Arctic and the Pacific

.The country has many lakes , with the Great Lakes included .There are also  many rivers on the US territory.The longest of them are the Mississippi,the Missouri, the Columbia, the Rio Grande and some others.On the US territory there are mountains and  lowlands.The highest mountains are the Rocky mountains,the Cordillera and the Sierra Nevada .The highest peak , mount  MeKinley, is located in Alaska.The climate conditions are rather different .The country is rich in natural and  mineral resources :oil,gas, iron ore,coal and various metals.

The Usa is a highly developed indstrial and agriculture  country.The main industrial brances  are aircraft , rocket , automobile , electronic , radio-engineering and others. American are  made uo from nearly all races and nations .The country population is over 250 mln.The  national symbol of the USa is its national flag "Stars and Stripes " having 50 white stars  and 13 white and red stripes on its field , symbolising the number of the original  and present day states .

Officially the country comprises 50 states and one District of Columbia .The states differ in size , population and economic development.Each state

 its own capital.The capital of the USA is Washington.It is situated in the District of Columbia on the banks of the Potomac river and its named after the 1st US President - George  Washington.Thre are many large  cities in the country:New Yourk, Los Angeles , Chicago, Philadelphia, Detroit, San-Francisco,Cleveland and some others .

The  The United States of America to the US Constitution the powers of the Government are divided into 3 branches :legislative, executive and judicial.

The legislative power belongs to the Congress consisting of the Senate and the House of Representatives.The Senate represents the states while the House of  Representatives- the population.The executive power belongs to the President and his Administration ( Vice-President and Cabinet of Ministers ).The judicial power belongs to the Supreme Court and the system of Federal, state and district Courts.

There are several political parties in the UKA, the largest of them are the Republican ( symbolised by a donkey)and the Democratic (symbolised by an elephant)

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