Предмет: Геометрия, автор: afalter

Биссектриса угла A параллелограмма ABCD пересекает сторону BC в точке K. Найдите периметр параллелограмма, если BK=10, CK=18.

Ответы

Автор ответа: dobryajalizka

62

АК - биссектриса, поэтому угол ВАК=КАД, а угол КАД=ВКА (как накрест лежащие при параллельных прямых), поэтому треугольник ВАК - равнобедренный, ВА=СД=10, а стороны ВС=АД=10+18=28, отсюда периметр=10+10+28+28=76

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Алгебра, автор: FanSover

-5x-1=0....................

2 года назад

Предмет: Английский язык, автор: gfddddgd

ПОМОГИТЕ ПОЖАЛУЙСТА ПО АНГЛИЙСКОМУ
Choose the right variant
1. Not much ... about the accident since last week. *
1)has said
2)said
3)has been said
2. A prize ... to whoever solves this task. *
1)will be giving
2)will be given
3)gives
3. When the chef arrived, the problem ... . *
1)had already been solved
2)had already solved
3)had solved
4. A cat ... by the small red car. *
1)was hitting
2)was hit
3)is hitting
5. Many car accidents ... by dangerous driving. *
1)caused
2)are caused
3)have been caused

2 года назад

Предмет: Математика, автор: 87712463842a85

X+5-7+12=35 решите уравнение

2 года назад

Предмет: Английский язык, автор: alba1937

Mowa zależna

1. These people are saying these things. Report them, using says that.

a. Paul: “Atlanta is a wonderful city.” ____________________________________________________

b. Ruth: “I go jogging every morning.” ___________________________________________________

c. Anna: “Jenny isn’t studying for her exams.” _____________________________________________

d. Andrew: “I used to be very fat.” _______________________________________________________

e. e.- Jim: “I can’t swim.” ______________________________________________________________

6

2. People made these statements. Report them, using said.

a. “Mary works in a bank”, Jane said. ____________________________________________________

b. “I’m staying with some friends”, Jim said. _______________________________________________

c. “I’ve never been to Russia”, Mike said. _________________________________________________

d. “Tom can’t use a computer”, Ella said. _________________________________________________

e. “Everybody must try to do their best”, Jill said. __________________________________________

f. “Jane may move to a new flat”, Rachel said. ____________________________________________

g. “I’ll stay at home on Sunday”, Bill said. _________________________________________

4. Change the following statements into the reported speech.

a. “I have something to show you”, I said to her.

_________________________________________________________________________________

b. “I’m going away tomorrow”, he said.

_________________________________________________________________________________

c. “I’ve been in London for a month but I haven’t had time to visit the Tower”, said Rupert.

_________________________________________________________________________________

d. “I’ll come with you as soon as I’m ready”, she replied.

_________________________________________________________________________________

e. “We have a lift but very often it doesn’t work”, they said.

_________________________________________________________________________________

f. “I must go to the dentist tomorrow”, he said.

_________________________________________________________________________________

g. “I found an old Roman coin in the garden yesterday and I am going to take it to the museum this

afternoon”, he said.

_________________________________________________________________________________

5. Write these sentences in reported speech.

a. “I’m very tired”, she said. ____________________________________________________________

b. “I’ll see them soon”, he said. _________________________________________________________

c. “I’m going to the cinema”, she said. ___________________________________________________

d. “I see the children quite often”, he said. ________________________________________________

e. “I’m having a bath”, she said. _________________________________________________________

f. “I’ve already met their parents”, she said. _______________________________________________

g. “I stayed in a hotel for a few weeks”, she said. ___________________________________________

h. “I must go home to make dinner”, he said. ______________________________________________

i. “I haven’t been waiting long”, she said. _________________________________________________

j. “I’m listening to the radio”, he said. ____________________________________________________

k. “I’ll tell them the news on Saturday”, she said. ___________________________________________

l. “I like swimming, dancing and playing tennis”, he said. ____________________________

3 okres warunkowy

Put in the correct third conditional verb form:

1. If you ______________ (not / be) late, we ______________ (not / miss) the

bus.

2. If she ______________ (study), she ______________ (pass) the exam.

3. If we ______________ (arrive) earlier, we ______________ (see) John.

4. If they ______________ (go) to bed early, they ______________ (not / wake)

up late.

5. If he ______________ (become) a musician, he ______________ (record) a

CD.

6. If she ______________ (go) to art school, she ______________ (become) a

painter.

7. If I ______________ (be) born in a different country, I ______________

(learn) to speak a different language.

8. If she ______________ (go) to university, she ______________ (study)

French.

9. If we ______________ (not / go) to the party, we ______________ (not /

meet) them.

10. If he ______________ (take) the job, he ______________ (not / go) travelling.

© 2009 www.perfect-english-grammar.com

May be freely copied for personal or classroom use.

11. He ______________ (be) happier if he ______________ (stay) at home.

12. She ______________ (pass) the exam if she ______________ (study) harder.

13. We ______________ (not / get) married if we ______________ (not / go) to

the same university.

14. They ______________ (be) late if they ______________ (not / take) a taxi.

15. She ______________ (not / meet) him if she ______________ (not / come) to

London.

8 лет назад

Предмет: География, автор: foxydii

какие три из перечисленных пород деревьев характерны для Средней Сибири? Ответ запишите в виде последовательности букв в алфавитном порядке.

а) береза
б) лиственница
в) осина
г) сибирская ель
д) сибирский кедр
е) сосна

8 лет назад