Предмет: Алгебра, автор: fedorkravcov

в треугольнике ABC угол ABC = 66 градусов. Найди угол AOC, если:

O — точка пересечения высот

Ответы

Автор ответа: Аноним
0

Проведем в Δ АВС с ∠В=66° высоты СС1 и АА1.

Все высоты пересекаются в т.О (замечательная точка). См. фото.

Если ОС1ВА1 разделить на 2 Δ диагональю, получим 2 Δ по 180°. ⇒

Сумма углов ОС1ВА1=360°.

∠С1ОА1=360-90-90-66=114°.

Этот угол = ∠АОС (вертикальные).

Ответ: ∠АОС=114°.

Приложения:
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Английский язык, автор: karakum16
 помогите пожалуйста с переводом,спасибо огромное!                                                  1.  Rupinder was sitting by  himself in the house.It was an important day.Today he and his  family were going to leave their village.They were going to emigrate to England.He was feeling very excited and sad.He was feeling sad because he was going to leave his home, his  village and his friends.He thought: ''I will miss them all.I will probably not like England.I will probably want to come back.''                                                                                          2.    Outside there was a  crowd of people. They were his relatives and his neighbours.They were all waiting for the bus to Jullunder,the nearest town.There they could take a train to New Delhi.In New Delhi they wanted to take their plane to England.Everybody was going to travel to Jullunder with them to say goodbye.His parents and his sister,Hardeep,were outside,too.He could hear them talking.Hardeep was very excited.She was laughing and talking to her two friends:"We are going to lsve in England.We are going to travel in a big plane.We are going to live in a big house.And i am going to go to an English school."She was very happy.                                                                                                             3.    "Oh,look!Here's the bus.Where is Rupinder?""Rupinder!Where are you?It's time to go."Everybody got into the bus.It was very crowded inside. There was a lot of luggage on the uoof.The driver fixed their boxes onto the roof.It was not far to Jullunder.It only took an hour.     4 .   At the station everyone waited for the train to New Delhi.Everyone was laughing and talking.Two of their neighbours put garlands of flowers round their necks.Grandmother gave Rupinder some sweets and oranges in a basket.His best friend gave him some cakes."You are a lucky boy,Rupinder.I would like to go,too.Write to me.Don't forget me.Send me a postcard of London."                             Then the train came.It was a steam train.Hardeep was frightened."I don't like the noise.Idon't want to go.""It's all right,Hardeep.It's guite safe.Look at all the people on the train.Come on.Get in here."The father found four seats for them.Everyone was shouting:"Goodbye!Goodbye!Have a safe journey!Write to us when you get to England.Goodbye!"Their grandmother was crying and their relatives looked sad.         5.   It was a very long journey to New Delhi.It took eight hours.The train was hot and crowded.Hardeep was excited and impatient."How far is it to New Delhi?What time shall we get there?"Rupinder was guiet.He was looking out of the window.There were men working in the fields."Look,Hardeep,there's a baby donkey with his mother."But Hardeep was asleep.Soon Rupinder was asleep,too.
1 год назад
Предмет: Русский язык, автор: letovaira
надо вставить слово: ....- это буква или сочетание букв, которые требуют проверки
1 год назад
Предмет: Английский язык, автор: Аноним
5 предложений о защите природы с переводом плииииииииз
1 год назад
Предмет: Математика, автор: ника800
Найдите корень уравнения 5/6х+2=1/3х+1
8 лет назад
Предмет: Обществознание, автор: 11lulu
Сравните правовой статус несовершеннолетнего и совершеннолетнего работников.Выберите и запишите в первую колонку таблицы порядковые номера черт сходства, а во вторую колонку – порядковые номера черт отличия. 1) обязательное заключение трудового договора2) возможность привлечения к сверхурочной работе, работе в ночное время3) требование соблюдения трудовой дисциплины4) продолжительность отпуска – 31 календарный день
8 лет назад