Предмет: Геометрия, автор: zolnikovale

Углы 1 и 2 - внутренние односторонние при двух параллельных прямых и секущей. Найдите величины углов 1 и 2, если угол 1 в 4 раза больше угла 2.

Ответы

Автор ответа: HelenLang

∠1+∠2= 180° (свойство односторонних)
Пусть ∠2- х, тогда ∠1- 4х. Составим и решим уравнение:
х+4х= 180°
5х= 180°
х= 180:5
х= 36°- ∠2
Тогда ∠1= 36*4= 144°
Ответ: ∠1= 144°, ∠2= 36°.

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: maki59

Какие трудности я испытываю при изучение русского языка(Сочинение 5 класс)

6 лет назад

Предмет: Математика, автор: lizid2

8 18/21+(58/21-x)=11 3/21

6 лет назад

Предмет: Английский язык, автор: fqweqwfqwef2

8. Спишите. Отметьте правильный вариант.
1. The typist is away; these papers can't … now.
a) type
b) to type
c) have typed
d) be typed
2. You … do it now. You can do it tomorrow.
a) mustn't
b) needn't
c) can't
d) may not
3. When David came, everybody … .
a) examined
b) was examined
c) was examining
d) had been examined
4. Martin Eden … by Jack London.
a)wrote
b)was written
c)has written
d) is writing
5. I … the Browns all my life.
a) know
b) knew
c)have known
d) had known
6. The figures … were published in «Times» yesterday.
a) had referred to
b) referred to
c) will refer
d) were referred to
7. If I don't study for the next test, I … fail it.
a) ought to
b) should
c) might
d)will have to
8. There aren't … easy ways of learning a foreign language.
a) some
b) no
c) any
d) the
9. … is only one of her books which I have not read.
a) There
b) It
c) These
d) Those
10. Their engagement … in the local newspaper.
a) was announced
b) is being announced
c) has been announced
d) had announced
11. When … last to the theatre?
a) did you go
b) have you gone
c) will you go
d) were you going
12. … are fewer days in February than in other months.
a) There
b) These
c) It
d) Those
13. By the time we got to the party, most of the guests … .
a) left
b) have left
c) will left
d) had left
14. Where … ? - To the office. Sorry, I can't talk to you now.
a)you hurry
b)are you hurrying
c) do you hurry
d) have you hurried
15. We see … way out of this situation.
a) no other
b) not any other
c) no another
d) not the other

6 лет назад

Предмет: Алгебра, автор: Kek86

Найдите значение выражения: х^3+3у^2 при х=-2, у=-1

9 лет назад

Предмет: Обществознание, автор: kate11346

конспект на тему "закрытое и открытое общество"

9 лет назад