Предмет: Математика, автор: michael13voitenko

Сформулюйте та доведіть теорему, обернену теореми Піфагора.

Ответы

Автор ответа: nykolaichukmacha

0

Ответ:

Доведення: Нехай у трикутника:. Доведемо, що кут прямий. Побудуємо прямокутний з катетами і . За теоремою Піфагора і отже, . Але за умовою теореми. Тоді або. Отже трикутники і рівні за трьома сторонами. З рівності трикутників випливає, що угол трикутника – прямий.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Қазақ тiлi, автор: djsjdjdkkdjx

Каз яз 5 класс стр 65 номер 10

11 месяцев назад

Предмет: Русский язык, автор: issa255

Задание 5. От данных ниже глаголов образуйте деепричастия совершенного вида, обозначьте суффиксы:
Замер -
Почувствовал -
Безмолвствовать -
Записать -
Расстелила -
С 2 деепричастиями составить и записать предложения:
Даю 40 баллов

11 месяцев назад

Предмет: Английский язык, автор: abdulbosidmahmmudov

5 Complete the sentences with less, the least, fewer, or the fewest. 1 The kitchen is house. 2 My flat is yours. 3 This house has got we've looked at. 4 Which costs or the terraced house? year than last. 5 This is 6 Which room has got room, living room, or kitchen? 7 There are 8 Wales is Scotland. spacious room in the conveniently located than rooms of the three ,the semi-detached house popular area of the city. furniture, the dining flowers in the flower bed this remote than the north of

11 месяцев назад

Предмет: Английский язык, автор: Galaxyopen

Use of English (vocabulary/ grammar)

Use the verbs in brackets to complete these sentences in the most common form.

1.Не often (bring) me flowers.

2.I (meet) Paul yesterday.

3.They (visit) us tomorrow. They have just rung me up.

4.What (you/do) next morning?

5.Mr Jones (buy) a car last month.

6.Mary (go) to school on foot every day.

7.It (be) hot soon.

8.The baby (not/sleep) well last week.

9.He never (drive) fast.

10.Lessy (live) in Paris in 1989.

11.Mark ... (not finish) his essay yet.

12.I'm afraid we ... (not go) to the party tomorrow.

13.He … (not meet) his friend every week.

14.She … (meet) her friends in the park tomorrow at 2 p.m.

15.When ... you … (go) to buy the tickets?

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО! ДАМ ВСЕ БАЛЛЫ!

6 лет назад

Предмет: Английский язык, автор: Lexa46

1. It was the (самая трудная) problem I've ever solved.
a) difficultest; b) difficult;
c) most difficult d) more difficult.
2. (Эти) museums are well-known all over the "world.
a) this; b) these;
c) that d) those.

3. Tell (им) about your travelling.
a) they; b) their;
c) them; d) her
4. This town is very green because there are a lot of trees in (его) streets.
a) him; b) his;
c) its; d) it
5. (Наша) country is one of the largest countries in the world.
a) we; b) our;
c) their; d) her
6. Peter the Great was a great reformer, (его) reforms changed Russia greatly.
a) its; b) he;
c) him; d) his
7. Are there... places of interest in your town? - Yes, there are...
a) any; b) no;
c) some; d) something
8. He saw... interesting in this museum.
a) anything; b) somewhere;
c) nothing; d) anywhere
9. ___ rang you up.
a) somewhere; b) anybody;
c) something; d) somebody.
10. ... building of this city attracts thousands of tourists.
a) some; b) any;
с) something; d) anything.
11. Unfortunately,... knew the history of this ancient region.
a) nobody; b) somebody;
c) anybody; d) nothing

12. In Moscow some museums contain originals or excellent copies of works by old masters.
a) does; b) do;
c) did; d) are
13. The Manage … reconstructed soon.
a) will; b) shall;
c) is; d) have
14. I shall see a lot of sightseeing in Moscow next, summer.
a) will; b) has;
c) shall; d) am
15. Did he... the week-end in the country?
a) spent; : b)spend;
с) spends; d) spending
16. The students... some foreign languages.
a) study; b) studies;
c) studying; d) to study
17. She often …..on business to Kiev.
a) go; b) went;
c) gone; d) goes
18. There... a lot of cities and towns in this country.
a) is; b) are;
c) am; d) was
19. The Volga... the longest river in Europe.
a) is; b) am;
c) are; d) were
20. They... several pictures of St. Petersburg.
a) is; b) has;
c) have d) having
21. There... lectures on Russian history next week.
a) will; b) will be;
c) shall; d) are
22. Red Square... many historic associations.
a) have; b) having;
c) has; d) is

6 лет назад