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It happened in Vienna many years ago. Every evening an old man played the violin in one of the streets. People passed by and put some money into the man’s hat. One night it was very cold and rainy. The old musician was playing the violin near the door of a restaurant, but the people didn't stop to listen to him. Nobody gave him any money. He was very tired and hungry and couldn't play any longer. Suddenly a young man came up to him and asked, "Why did you stop playing?" The old man answered, "Nobody wants to listen to my music." The young man took his violin and began playing. He played so beautifully that very soon there were a lot of people around him. Everybody liked the music and put a lot of money into the old man's hat. Soon the hat was full of money. The old man wanted to thank the young man, but he could not find him. Nobody knew that he was the great Paganini.Задание 1. 1Выберите подходящий по смыслу заголовок к тексту.a) The great Paganini b) The musician and the violin c) The old musicianЗадание 2. Какие предложения соответствуют содержанию текста (True), какие не соответствуют ( False Обведите соответствующую букву.1. Every morning an old man played the violin in one of the streets. a) True b) False2. The young man took his violin and began dancing. a) True b) False3. Nobody knew that he was the great Paganini. a) True b) False4. One night it was very hot and rainy. a) True b) False5. Everybody liked the music and put a lot of money into the old man's hat. a) True b) FalseЗадание 3. ответьте на во по тексту полным ответом 1. What musical instrument did an old man play?2. Where did people put money?3. Why couldn't the old man play any longer? 4. How did the young man help the old musician?5. What was the name of the young musician?​

Геометрия

Ответы

kreon1
1.
Все грани куба - квадраты. Тогда ребро куба:
а = √9 = 3 см
V = a³ = 3 = 27 см³

2.
а = 2 см - ребро основания призмы,
α = 30° - угол в основании,
h = 3 см - высота призмы.

V = Sосн · h

Sосн = a²·sinα = 4 · 1/2 = 2 см²

V = 2 · 3 = 6 см³

3.
В основании правильной треугольной пирамиды - правильный треугольник со стороной а = 5 см.
ОС = а√3/3 = 5√3/3 см как радиус описанной окружности.
ΔSOC - прямоугольный, равнобедренный, значит высота пирамиды
SO = ОС = 5√3/3 см

V = 1/3 · Sосн · SO
V = 1/3 · a²√3/4 · SO
V = 1/3 · 25√3/4 · 5√3/3 = 125/12 см³
simplexsol

ответ:1 задание - по 2м сторонам и углу между ними (1 признак)

2 задание - по 3м сторонам (3 признак)

3 задание - по стороне и 2м прилежащем углам (2 признак)

4 задание - нет (т.к. Они равны по по 2 признаку, BD- общая)

5 задание - по 2м сторонам и углу между ними (1 признак)

Задачи:

1)ОК=ОМ(усл)

2)Угол КОР = угол МОР (т.к бисс.)

3)ОР - Общ.

Из этого всего => треугольники равны, по 1 признаку.

Уг М = уг Т(Т.к. уг Р=уг К, вертикальные углы при точке О)

1)Уг М= уг Т

2)Вертикальные при т. О

3)МО=ОТ(усл)

Из всего этого => треугольники равны по 2 признаку

Объяснение:

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It happened in Vienna many years ago. Every evening an old man played the violin in one of the streets. People passed by and put some money into the man’s hat. One night it was very cold and rainy. The old musician was playing the violin near the door of a restaurant, but the people didn't stop to listen to him. Nobody gave him any money. He was very tired and hungry and couldn't play any longer. Suddenly a young man came up to him and asked, "Why did you stop playing?" The old man answered, "Nobody wants to listen to my music." The young man took his violin and began playing. He played so beautifully that very soon there were a lot of people around him. Everybody liked the music and put a lot of money into the old man's hat. Soon the hat was full of money. The old man wanted to thank the young man, but he could not find him. Nobody knew that he was the great Paganini.Задание 1. 1Выберите подходящий по смыслу заголовок к тексту.a) The great Paganini b) The musician and the violin c) The old musicianЗадание 2. Какие предложения соответствуют содержанию текста (True), какие не соответствуют ( False Обведите соответствующую букву.1. Every morning an old man played the violin in one of the streets. a) True b) False2. The young man took his violin and began dancing. a) True b) False3. Nobody knew that he was the great Paganini. a) True b) False4. One night it was very hot and rainy. a) True b) False5. Everybody liked the music and put a lot of money into the old man's hat. a) True b) FalseЗадание 3. ответьте на во по тексту полным ответом 1. What musical instrument did an old man play?2. Where did people put money?3. Why couldn't the old man play any longer? 4. How did the young man help the old musician?5. What was the name of the young musician?​
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