Найти углы треугольник АВС, если угол А: угол В: угол С =2:3:7. - №19211888

Найти углы треугольник АВС, если угол А: угол В: угол С =2:3:7.
- Предмет:
  Геометрия
- Автор:
  bingotijr
- 5 лет назад

Ответы 1

Пусть на одну часть приходится х гр.∠А=2х; ∠В=3х; ∠С=7х2х+3х+7х=180°12х=180°х=15°∠А=2*15°=30°∠В=3*15°=45°∠С=7*15°=105°
- Автор:
  quinn
- 5 лет назад
- 0
Добавить свой ответ

Еще вопросы

ПОЖАЛУЙСТА!!!! ПОМОГИТЕ МНЕ!! КТО ГЛАВНЫЙ ГЕРОЙ В СКАЗКЕ МЕДНОЙ ГОРЫ ХОЗЯЙКА И ЧЕМ ОНИ ВАМ ПОНРАВИЛИСЬ
- Предмет:
  Литература
- Автор:
  shaylee5tb4
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Между городами А и Б расстояние равно 110 км. Два автомобиля, выехав одновременно из этих городов навстречу друг другу, встречаются через 2 часа. Известно, что скорость автомобиля выехавшего из Б на 5 км/ч меньше скорости другого автомобиля. Найдите скорости автомобилей и время, через которое один догонит другого, если автомобили будут ехать из А и Б в одном направлении
- Предмет:
  Математика
- Автор:
  guido
- 5 лет назад
- Ответов:
  
  1
- Смотреть
Пожалуйста помогите я вам тоже помогу!!!!! Это жизни и смерти!!!!!
1) Find the adjectives.
1. Love, using, historic
2. Helper, beauty, creative, music
3. Talkative, impress, cultural, history
4. Russian, talk, humorous, creator
2) Choose the correct variant.
1. Would you mind___ the door?
a) close b) to close c) closing
2. I like___ in bed.
a) read b) to read c) reading
3. I would like _____ you to the party.
a) invite b) to invite c) inviting
3) Choose the correct variant.
1. I would like___ in bed.
a) read b) to read c) reading
2. I want ____ you to the party.
a) invite b) to invite c) inviting
3. They enjoy ___ comedy films in the evening.
a) watch b) to watch c) watching
4. He gave up ___ fatty food.
a) eat b) to eat c) eating
4) Find the special questions.
1. Are you looking for a chance to visit an English- speaking country?
2. Do you hope to win Round-the-World tour?
3. Did you lose the game?
4. What clothes does your friend prefer?
5) Mark the right answer. The students of Theatre Club are very... . They write plays and songs and put on performances.
-sociable -talkative
-careful -creative
6) Express the same using active costructions.
1. Computers are usually used by students at the lessons.-
2. He will be found by them in a few days.
- 7) Choose the correct variant.
1. They hate ___ horror films in the evening.
a) watch b) to watch c) watching
2. Penguins can't ___.
a) fly b) to fly c) flying
3. Can you ____ the door?
a) close b) to close c) closing
8) Choose the necessary word.
1. On Halloween people wear unusual clothes, such as: costumes of ghost, witches and ...
a) skeletons: и) sweetheart: с) religious.
2. They ... eyes and mouth from the pumpkin and put a candle inside.
a) carved: b) hunted: c) took.
3. No Halloween party is complete withut a ... story.
a) funny; b) scary; c) interesting.
4. People decorate houses in the traditional colors: orange and ...
a) grey; b) pink; с) black.
9) Choose the proper verb to each of the nouns.
-croos -number
-wear -fingers
-hate -mirror
-stand -costumes
-break -candle
10) Put the verbs into the correct form (Present Simple or Present Continuous).
1. Tony and Jack (answer) the questions for the Young Photographers' Competition.
2. Sandy (get up), (wash) her face, (do) her morning exercises and (go) to school every day.
11)Agree or disagree with sentences.
1. Our foreign language is English.
2. We study Polish at school.
3. English is an official language in Russia.
4.Russian is our mother-tongue.
12)Give the Russian equivalents of the following proverbs:
1. Dry bread at home is better than roast meat abroad.
2. Better an egg today than hen tomorrow.
13) Choose the correct variant.
1. We ___ part in the competition yesterday.
a) take b) has taken c) took
2. We ____each other every day.
a) phone b) phones c) are phoning
3. I __ a letter tomorrow.
a) writes b) am writing c) will write
14) Express the same using active constructions.
1. The rules were explained to the students by the teacher.
2. The private school si often attended by some children.
15) Finish the sentences.
1. A good friend should be...
2. A real teacher shouldn't ...
3. At school I study ...
4. It takes me ... minutes to go to school.
16) Express the same using active constructions.
1. Some extra subjects at school will be learned by Helen next year.
2. Terry's dad was phoned by the police.
3. The party is usually arranged by students.
17) Choose the right comparative form:
1. Nick is (happier, the happiest) boy that I know.
2. Of the six cars, I like the silver one ( better, best).
3. Jane's notebook is (cheaper, the cheapest) than mine.
18) Choose the right form:
1. Her parents want ... to behave well at school.
a) him b) her c) she
2. During World War II many cities ... by the German army.
a) were occupied b) occupied c) will be occupied
3. My neighbour is a lecturer; she ... French at the university.
a) studies b) learns c) teaches
19) Find and correct the mistakes:
I wont tell abaut my perents. My Mummy fourty-eiht, she are a ticher of the Englich at the Univercity. My Dad is fivty, he is a painter. My perents to like they work veri much. I love my perents and their love me.
20) Put in his, her, ours. mine, yours.
1. Bess usually cleans ... boots. Jack cleans ..., and I clean ... .
2. This is my house and ... is near the shop.
3. We have 3 cats at home. These cats are ... .
4. I have given you another pen. This one is not ... .
21) Translate from into Engluish
среднее образование-
высшая школа-
хорошее поведение-
22) Put in the missing prepositions ( to, of, for, after, at):
1. I'm sorry, I can't go for a walk with you. I have to look ... my little brother.
2. Listen ... the song. What is it about?
3. She always laughs ... silly jokes.
4. Parents take care ... their children.
5. Mike's father pays ... his education.
23) Make questions:
1. The TV set was bought in the shop. ( What? Where?)
2. Football is played all over the world because it is a very popular game. ( Why?)
- Предмет:
  Английский язык
- Автор:
  sydnee
- 5 лет назад
- Ответов:
  
  6
- Смотреть
цветы подрезать под корень,
тропинка спускалась с горы,
ленту плести в косу,
колобок скатился с окошка,
покатился по дорожке докатился до леса,доводи дела до конца......Подчеркни глаголы в прошедшем времени
- Предмет:
  Русский язык
- Автор:
  peppa pigzzd2
- 5 лет назад
- Ответов:
  
  2
- Смотреть

How much to ban the user?

1 hour 1 day 100 years