Предмет: Геометрия, автор: Аноним

в треугольнике ABC AB=6см, AC=9, уголA=30.Найти площадь треугольника ABC

Ответы

Автор ответа: 8Hyper8

Проведем прямую BH известно, что а= 30 след. BH= AB/2= 3см.
S= основание*высоту= 9*3=27см

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Алгебра, автор: aleksandrkynov

Помогите тест решить плиз;3

5 лет назад

Предмет: Английский язык, автор: SENPlay023

СРОЧНО ДАЮ 100 БАЛЛОВ. надо выбрать 1 из 3 вариантов.

1. ... Australia is the biggest continent in the world

a. - b. The c. An

2. Don't be late. The film ... at 8 p.m.

a. is starting b. will start c. starts

3. My sister ... for a new job at the moment

a. looks b. is looking c. looked

4. We can buy some stamps st the ...

a. butcher's b. post office c. florist's

5. Penny can play ... piano

a. the b. a c. -

6. Jerry is tired. He ... all day

a. has been working b. have worked c. worked

7. I prefer scrambled ...

a. rice b. chicken eggs

8. John works Monday to Friday, 9 to 5. It's a ... job.

a. part-time b. full-time c. overtime

9. I promise I ... you tidy the house.

a. will help b. am going to help c. am helping

10. Paul is the ... person in the office.

a. funny b. funnier c. funniest

11. Jack ... to the gym on Sundays.

a. go b. goes c. is going

12. I speak English ... than my sister.

a. gooder b. better c. the best

13. Costumes ... by John Napier.

a. was designed b. were designed c. designed

14. She has got a very ... figure.

a. frizzy b. bushy c. slim

15. ... is a good form of exercise.

a. Swimming b. Swim c. To swim

16. She fainted while she was getting a blood ...

a. exam b. degree c. test

17. ... I take your pen?

a. May b. Must c. Should

18. ... you like ice cream?

a. Have b. Does c. Do

19. Anna hasn't finished chopping the vegetables ...

a. just b. yet c. ago

20. Tina can ... well.

a. to dance b. dance c. dancing

21. I ... in the garden when Betty called me.

a. worked b. had worked c. was working

22. The gym where my granddad goes has special classes for ... citizens.

a. senior b. toddler c. infant

23. She ... a letter to my mum every day.

a. writes b. is writing c, wrote

24. I ... Linda at yesterday's meeting.

a. didn't see b. hadn't seen c. haven't seen

25. They are having breakfast ...

a. yesterday b. every day c. now

26. It's an ... film but I don't think it will win any awards.

a. more interesting b. most interesting c. interesting

27. It's cold in here. I ... the window.

a. am closing b. will close c. am going to close

28. The actress got angry when the ... started asking her personal questions.

a. operator b. journalist c. sound engineer

29. He likes playing ... basketball.

a. - b. the c. a

30. Yesterday at 6 p.m. I ... computer games.

a. play b. have played c. was playing

5 лет назад

Предмет: Математика, автор: ordinaryrunning

30. в детский сад привезли 20 кг муки. Из 4 кг
муки испекли блины, а из 8 кг булочки.
Сколько килограммов муки осталось?
Реши задачу разными способами.

5 лет назад

Предмет: Математика, автор: nikitaswibowits

С автостанции одновременно в одном направлении выехали 2 автобуса. Скорость одного автобуса 50 км/ч, а другого -65 км/ч. Какое расстояние будет между автобусами через 3 ч?

9 лет назад

Предмет: География, автор: Bako5

Какой материк был открыт посследним?

9 лет назад