Предмет: Геометрия, автор: Shkurovv

Из точки А, удаленной от плоскости на расстояние 15, проведены к этой плоскости наклонные АВ и АС под углом 30o к плоскости. Их проекции на плоскость образуют угол в 120o. Найдите ВС.
Ответ ввести только числом.

Ответы

Автор ответа: nekitv283

Ответ:

проекции по 15 V3 (корней из 3). О основание, то треугольник ВОС равнобедренный, ОН его высота ВН=7,5корней из 3,то ВС=15корней из 3.

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1. Yesterday from 3 to 6 I _______ my new game. a) played b) was playing c) had played 2. When my Mom phoned me I ______ TV. a) was watching b) watched c) watching 3. When she ____, her brother ______ the dinner. a) had come, was cooking b) came, was cooking 4. If you ___ the medicine, you ___ better. a) take, would feel b) taken, felt c) took, would feel 5. ___ Volga is the longest river in ___ Europe. a) the, the b) - , the c) the, - 6. The capital of ___ USA is ___ Washington. a) the, - b) - , - c) the, the 7. It was a man … had never eaten Chinese food. a) who b) which c) what 8. Lena says: “I will sleep after dinner”. a) Lena says that I will sleep after dinner. b) Lena says to me that I will sleep after dinner. c) Lena says that she will sleep after dinner. 9. I don’t need this book, so it’s … for me. a) useful b) use c) useless 10. He says: “John is my classmate”. a) He says to John that I am his classmate. b) He says that John is my classmate. c) He says that John is his classmate. 11. This street is very ___. a) polluted b) pollute c) pollution 12. I saw the _____ and began to move towards it. 1. noise b) atmosphere c) satellite 13. When he ____ his friends had already gone to the cinema. a) come b) was coming c) came1. Yesterday from 3 to 6 I _______ my new game.
a) played b) was playing c) had played
2. When my Mom phoned me I ______ TV.
a) was watching b) watched c) watching
3. When she ____, her brother ______ the dinner.
a) had come, was cooking b) came, was cooking

4. If you ___ the medicine, you ___ better.
a) take, would feel b) taken, felt c) took, would feel
5. ___ Volga is the longest river in ___ Europe.
a) the, the b) - , the c) the, -
6. The capital of ___ USA is ___ Washington.
a) the, - b) - , - c) the, the
7. It was a man … had never eaten Chinese food.
a) who b) which c) what
8. Lena says: “I will sleep after dinner”.
a) Lena says that I will sleep after dinner.
b) Lena says to me that I will sleep after dinner.
c) Lena says that she will sleep after dinner.
9. I don’t need this book, so it’s … for me.
a) useful b) use c) useless
10. He says: “John is my classmate”.
a) He says to John that I am his classmate.
b) He says that John is my classmate.
c) He says that John is his classmate.
11. This street is very ___.
a) polluted b) pollute c) pollution
12. I saw the _____ and began to move towards it.
1. noise b) atmosphere c) satellite
13. When he ____ his friends had already gone to the cinema.
a) come b) was coming c) came

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