Предмет: Геометрия, автор: Ирина755

В равнобедренной трапеции найдите:

б) боковую строну, если основания равны 6 корней из 2 и 4 корней их 2, а острый угол равен 45 гр

Ответы

Автор ответа: 250705v

в трапеции ВСДЕ СК перпедикулярно ВЕ, ДМ перпендикулярно ВЕ, СД=КМ=4 корней из2. сл-но, ВК=МЕ,т.к. трапеция равнобедренная, ВК=СЕ=(6 корней из2-4 корней из 2):2= корень из 2. Так как острый угол равен 45 град, то в прчмоугольном треугольнике ВСК и угол С= 45 град, сл-но, ВК=СК=корень из 2. По теореме пифагора ВС квадрат= Ск квадрат + ВК квадрат+корень из двух в квадрате+ коркнь из 2 в квадрете=2+2=4, значит ВС=корень из 4 =2 см.

ответ Вс=2 см.

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Задание с выбором нескольких правильных ответов
1.The correct form of the sentence:

Wonderful discoveries … by our scientists.

A)are being made
B)being made
C)is making
D)is being made
E)were being made
F)will be made
G)was being made
H)is made
2.Sentences intention:
A)I play football after school today.
B)The train leaves at 5.
C)Look at the clouds; it go to rain.
D)When I’ve finished this exercise I’m going to watch TV.
E)He going to fail the test, we noticed he doesn’t study much.
F)Next year he’s going to do his homework every night.
G)We have breakfast in London.
H)My parents are going to move to the country.

3.Scrolls were made in ancient Egypt from papyrus, which is made from the papyrus plant that grows in the NileRiver. The stems are cut and sliced into thin strips which are laid on top of each other in two layers, one horizontal and one vertical. They are then pressed so that the layers mesh together. Our word ‘paper’ comes from the word ‘papyrus’.

Scrolls were also used as books in ancient Greece and Rome. Scrolls are also made of different materials around the world: silk and paper in China, Japan and Korea, leather in Israel, Africa and the middle East, birch bark by some Native American.

The right answer is:

Papyrus is a …plant.

A)birch
B)leather
C)water
D)bark
E)paper
F)leaf
G)stems
H)silk

4.The task ... by our English teacher .

A)were given
B)is given
C)give
D)gives
E)gave
F)was given
G)be given
H)is gave

5.The affirmative sentence:

…people in the room

A)Is there many
B)There are many
C)Is there much
D)Are there
E)Is there
F)There isn’t much
G)There is much
H)There aren’t many

6.Sentences in Real Conditional are:

A)If he got up earlier, he wouldn’t always be late.
B)If I ate cake, I would get fat.
C)You won’t pass the exams if you don’t revise.
D)What would you do if you won a lot of money?
E)If he were rich, I wouldn’t have to work.
F)If I find time, I’ll try to help you.
G)If I saw him, I would invite him to the party.
H)What will you do if you win a lot of money?

7.The correct answers:

- How are you?

A)It’s hot.
B)I’m OK.
C)I’m so-so.
D)To the cinema.
E)It’s all right.
F)I’m so glad.
G)Thank you.
H)I’m fine.

8.The proper answers:

Why are you going to the shop?
A)Don’t worry.
B)It’s my classroom.
C)It’s time to go home.
D)To buy a disk with a new film.
E)I have some problems at school.
F)It’s my turn to do shopping.
G)We need some milk.
H)I’m glad to see you.

9.Comparative degree of the adjective:

A)the worst
B)more difficult
C)clever
D)bad
E)the hottest
F)worse
G)longer
H)the most beautiful

10.The proper variants:

You write on it.

A)dress
В)notebook
C)shelf
D)paper
E)towel
F)leaf
G)rucksack
H)blackboard

В равнобедренной трапеции найдите: б) боковую строну, если основания равны 6 корней из 2 и 4 корней их 2, а острый угол равен 45 гр

Ответы

В равнобедренной трапеции найдите:

б) боковую строну, если основания равны 6 корней из 2 и 4 корней их 2, а острый угол равен 45 гр