Предмет: Геометрия, автор: stee

   АААА помогите, уже голову сломал!!! 
Стороны равнобедренного треугольника АВ=ВС=50 и АС=60. Точки D и E - основания высот AD и CE. Определите стороны треугольника DBE.

Ответы

Автор ответа: Гоша68
0
AC*BK = BC*AD (K-основание высоты)
Bk=40
AD=60*40/50=48
BD^2=(50^2-48^2)=196
BD=14=BE
ED=2*BE*AK/AB=2*14*30/50=16,8
Автор ответа: Pasha1998NT
0
http://znanija.com/task/2420144 Помогите с задачей
Похожие вопросы
Предмет: Алгебра, автор: andrianabolotvina31
Предмет: Математика, автор: cernikovanika118
Предмет: Английский язык, автор: svetavasina2003
Задание 2 Прочитайте вопрос и три варианта ответа к нему. Выберите ответ, выделив его синим цветом.
Текст
Girl (G): Good morning.
Receptionist (R): Good morning. Can I help
you?
G: Are there any vacant rooms in the hotel?
R: Did you reserve a room beforehand?
G: I did.
R: Could you spell your name, please?
G: B-R-O-W-N
R: Just a minute, Miss Brown. Yes, that′s
right. We can offer you a single room on the
third floor.
G: Is there a shower?
R: There′s private bathroom, a TV set, and a
fridge.
G: Good. How much is it?
R: 30 dollars a night.
G: Oh, it′s a reasonable price.
R: Fill in this form, please, and sign here.
Here′s your key.
G: What′s time breakfast, by the way?
R: Any time between 7 and 10 downstairs in
the restaurant. There are coffee-stalls and
snack bars on every floor of the hotel.
G: Can I have breakfast in my room?
R: No problem. You can order it by phone.
Lunch is from 11 till 13, tea is at 5, and
dinner is at 6 or 7
G: That′s fine, thanks.
R: Have a good time, Miss Brown.


1Where did this conversation most probably take place?

at a restaurant

at a airport

at a hotel


2 Did Miss Brown reserve a room beforehand?

Yes, she did

No, she didn’t

She doesn’t remember


3 What did Miss Brown want in her room?

a shower

a bath

a refrigerator


4 Where did she want to have breakfast?

at a coffee-stall

in a restaurant

in her room


5 What did Miss Brown sign?

a letter

a registration form

an application form