-
через вершину прямого угла с , треугольника авс проведена высота сd . найти ав, если ас равно 10 см, аd равно 4см
Ответы 1
-
Получилось два подобных треугольника : ABC и CAD . В которых AC:AB = AD: AC . То есть АВ = (АС*АС) / AD . АВ = 10 * 10 / 4 = 25 см
-
Автор:
coltwilkins - 5 лет назад
-
0
-
-
Добавить свой ответ
Еще вопросы
-
A1.Next year he will … go to London.
1) be able to
2) can
3) need
4) must
A2.I like Pushkin. He … my favourite poet.
1) always was
2) is always
3)have always been
4) has always been
A3. If it … tomorrow, we’ll stay at home.
1) rains
2) will rain
3) rain
4)raining
A4. Can you see … car at the end of the street?
1) this
2) these
3)those
4) that
A5. Bob, you must do it … .
1) yourself
2)yourselves
3) himself
4)themselves
A6. Excuse me, but this is … pen.
1) my
2) mine
3) me
4)myself
A7. A lot of money … last year.
1) spent
2) is spent
3) was spent
4)has spent
A8. He’s never been there, …?
1)is he
2)has he
3) hasn’t he
4)hasn’t been he
A9. This is a very good idea,… ?
1)isn’t it
2)isn’t this
3) isn’t there
4)it isn’t
A10. I don’t know if it … tomorrow.
1 ) rains
2) rain
3) will rain
4)raining
A11. He asks what … .
1) she likes
2) did she like
3) does she like
4)do she like
A12.Neither Sam nor his friends … there.
1) never go
2) don’t go
3) go
4)not go
A13.Tom asked … rain the next day.
1) if it will
2) if it would
3) will it
4)would it
A14. … of you can speak English?
1) Who
2)Which
3) What
4)Whose
A15. Helen likes neither tea … coffee.
1) nor
2) or
3) and
4)with
Часть 2
B1-B5. Прочитайте текст и выберите правильный ответ.
My favourite book.
I am a student. In two years I will become a teacher of biology. I have to read a lot of books on biology. But I also read books on art, science and history. My parents are fond of reading. We have over 300 books of our favourite authors at home. Among them are plays by Shakespeare, historical novels by Walter Scott, detective stories by Conan Doyle and many others. When I have free time I read my favourite book by Hemingway «For Whom the Bell Tolls». Hemingway often describes in his books the events of the World War I and World War II, in which he took part. He was born in Chicago in 1899 and died in his house in Idaho in 1961. His books depicted the tragedy of war. The unique style of Hemingway, his realistic manner of writing brought him great success and the Nobel Prize in Literature. The main characters of my favourite book often find themselves in a difficult situation. The war influenced their lives greatly and made them stronger. They have to face death almost every minute and overcome their fear. But they do not lose the ability to love and share their feelings. Even in the last minute in his life, one of the principal characters supports his beloved and wishes her to become happy after his death. This book changed a lot in my views. Now I think that the most important thing in life is to find a person who can understand and support you in any situation, and whom you may take care of.
B1. The author reads a lot of books.
1) True
2) False
B2. The author's parents don't like reading.
1) True
2) False
B3. The author will become the teacher of biology in 2 years.
1) True
2) False
B4. Hemingway was born in Idaho.
1) True
2) False
B5. The author thinks that the most important thing in life is to find a person who can understand and support you in any situation.
1) True
2) False
-
Предмет:
Английский язык -
Автор:
havendillon - 5 лет назад
-
Ответов:
0 -
Смотреть
-
-
в автобусе 100 пас. 30чел.знают и немецкий и английский. 60 чел. низнают эти языки. 10 чел. знают только немецкий и 10чел. знают только английский задача на логику
-
Предмет:
Математика -
Автор:
cason - 5 лет назад
-
Ответов:
1 -
Смотреть
-
-
Помогите! Мне нужно составить предложение из слов: cooking-cook
Dancing-dance, singing-sing, theaching-teach-
Предмет:
Английский язык -
Автор:
estherbrewer - 5 лет назад
-
Ответов:
2 -
Смотреть
-
-
Ярик написал написал натуральное число. Первая цифра сдева в этом числе отлична от 0 и от последней цифры справа (цифры единиц). Если цифру единиц переставить на первое место слева,не меняя порядка остольных цифр то получится число кратное исходному. Найдите наименьше возможное число, обладающие таким свойством
-
Предмет:
Математика -
Автор:
meadows - 5 лет назад
-
Ответов:
0 -
Смотреть
-
Топ пользователей
-
Fedoseewa27
35934 -
Askold
2792 -
Pikachu
2228 -
hobbesbowers
2116 -
kaylynnbarron676
1818 -
女fei
1240 -
yulia-kaplina
1158 -
Poinntt
946 -
Bars
930 -
Queenmagic18
770
How much to ban the user?
1 hour
1 day
100 years