Предмет: Геометрия, автор: Sasha3441

В треугольнике ABC угол C равен 90 градусов tgB = 4/3. Найдите cosA

Ответы

Автор ответа: elena2028

1

Пусть длина АС=4х,тогда длина СВ=3х.По теореме Пифагора длина АВ=5х.Значит 5х cos альфа=4х cosA=4/5

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Обществознание, автор: msyto4ka

ПОЖАЛУЙСТА.Помогите пожалуйста. Заполните таблицу. ПОЖАЛУЙСТА.

5 лет назад

Предмет: Английский язык, автор: vvpmolod

ОЧЕНЬ СРОЧНО. ДАЮ 90 БАЛЛОВ!!
Task 1. Open the brackets using Present Simple, Present Continuous, Past Simple or Past Continuous. Write down full sentences.

Mary usually _____ (drive) to work when she lived in the suburbs.
Kids often _____ (go) to the mall on weekends.
I _____ (have) a terrible headache right now, I can’t play.
When my parents _____ (be) young, they both _____ (attend) the same school.
_____ (Josh / send) his letter yesterday?
3 hours ago Michael _____ (play) outside when you _____ (come).
Look! My dog _____ (play) with yours!
Last year Tim _____ (be) 14, so he is 15 now.
– _____ (it / rain)?
– No, not at the moment.
Turn off the lights – he _____ (sleep).

Task 2
Open the brackets and put the verbs into Present Simple, Present Continuous, Future Simple, or use the construction “to be going to”. Write down full sentences.

Bus usually _____ (arrive) at 10:00, but today it’s 15 minutes late.
I’m sure it _____ (rain) all spring.
We bought tickets and we _____ (visit) the museum at the weekend.
When I arrive I _____ (water) the plants as I haven’t been at home for a week.
If you do some exercises, you _____ (feel) better.
Sarah with her sisters _____ (go) shopping tomorrow as they all need new dresses.
Do you think Claire _____ (win) this match?
Steve is playing badly. He _____ (lose) the game.
He _____ (be late) if he doesn’t hurry up.
When _____ (the train / departure)?

Task 3
Put the verbs into the correct form: Present Simple, Present Continuous, Past Simple, Past Continuous, Present Perfect Simple, Present Perfect Continuous, or Past Perfect Simple. Write down full sentences.

Where were you?! I _____ (wait) for an hour and a half!
I _____ (reply) to 10 applicants so far.
When she _____ (be) a child, she _____ (love) cupcakes a lot.
_____ it your phone _____ (ring)? Pick it up!
Luckily, in 2001 everyone _____ (leave) before the bomb _____ (explode).

5 лет назад

Предмет: Қазақ тiлi, автор: kurmanovkarim5

68 бет 9 тапсырма мәтіндегі опфорграфиялык қателерді тауып, тыныс белгілерін дұрыс койып жаз

5 лет назад

Предмет: Математика, автор: ecir

чему равен объем прямоугольного параллелепипеда с рёбрами 5 см, 10 см, 60см ?

9 лет назад

Предмет: Математика, автор: 89877839392240189

Найди значение выражения.упр.130

9 лет назад