Предмет: Геометрия, автор: Neznau123321

найдите углы А и С трапеции АВСД с основаниями АД и ВС , если угол Д=40 градусов , угол В=100 градусов

Ответы

Автор ответа: Темирлан28

проведём высоту BH . УГОЛ abh=abc-hbc=100-90=10 градусов.Найдём уголC . Треугольник abh прямоугольный. Сумма острых углов прямоугольного треугольника равна 90 градусов.

значит угол С =90-10=80градусов. Аналогично проведём высоту CK. треугольник KCD ПРЯМОУГОЛЬНЫЙ. Сумма острых углов прямоугольного треугольника равна 90 градусов.

зНАЧИТ УГОЛ C = 90-40=50 градусов

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: fbjfj

The United Kingdom of Great Britain and Northern Ireland is situated off the Northwest coast of Europe. The UK consists of four parts. They are: England, Wales, Scotland and Northern Ireland. The UK is separated from the continent by the English Channel and the Strait of Dover. The west coast is washed by the Atlantic Ocean and the Irish Sea, the east coast is washed by the North Sea. The area of the UK is some 244,100 km. Its population is over 57 million people.
English is the official language. Britain has been many centuries in the making. The Romans conquered most part of Britain, but were unable to subdue the independent tribes in the West and in the North. Other invaders were Angles, Saxons, Vikings and Normans. For many centuries this country was known simply as England. It had a strong army and navy.
Geographically, Great Britain is divided into Lowland Britain and Highland Britain. The highest mountain, Ben Nevis, is in Scotland. The flora of the British Isles is much varied and the fauna is similar to that of the north-west of Europe. The country is not very rich in mineral and natural resources. There are many rivers in Great Britain. The Severn is the longest river; the Thames is the most important one.
The largest cities of Great Britain are: London, Birmingham, Glasgow, Manchester, Liverpool, Leeds, and Edinburgh.
Great Britain is a constitutional monarchy. The powers of the British Queen are limited by the Parliament. The British Parliament consists of the House of Lords and House of Commons.
The UK of Great Britain and Northern Ireland has always played an important role in world politics.
необходимо ответить на вопросы по тексту с переводом на рус.язык
1. Where is UK situated?
2. What parts does the UK consist of?
3. How many centuries has Britain been in making?
4. What country is GB?
5. Is the country rich in mineral and natural resources?
6. The Thames is the most important river of the country, is not it?
7. What are the largest cities of UK?
8. What can you say about the political system of the country?

6 лет назад

Предмет: Математика, автор: glivazhodzieva

выполните сложение 8+(-2целая5/7)

6 лет назад

Предмет: История, автор: ivanovamilana555

Учёные доказали что во 2 тысяч до нашей эры бойцы приручили лошадь это правда или ложь?

6 лет назад

Предмет: Геометрия, автор: KazubNasy

ABCD - параллелограмм CM - биссектриса.

требуется доказать что треугольник CMD - равнобедренный

10 лет назад

Предмет: Обществознание, автор: Утяяш

объясните смысл высказываний 1) "суд присяжных состоит из двенадцати человек, которые должны решить, чей адвокат лучше" 2)"нет ни преступления, ни наказания, если это не указано в законе"

10 лет назад