sakhnovavaleri1
01.10.2020 09:08

Choose and circle the correct passive variant (A, B, C or D) which is similar in meaning to the given sentence in the active voice. 1) John gave Sue a nice present.
A. John was given a nice present by Sue.
B. Sue was given a nice present by John.
C. A nice present was given to John by Sue.
D. A nice present was gave to Sue from John.

2) Kathie has written an article about homeless dogs.
A. Homeless dogs have been written by Kathie.
B. An article has been written about Kathie by homeless dogs.
C. An article about homeless dogs has been written by Kathie.
D. Kathie has been written an article about homeless dogs.

3) A thief stole Bob's painting.
A. Bob's painting has stole by a thief.
B. Bob's painting was stolen by a thief.
C. Bob's painting was stole by a thief.
D. Bob's painting was stealed by a thief.

4) Edith usually gives Sam interesting books.
A. Sam is usually given interesting books by Edith.
B. Interesting books are given to Edith by Sam.
C. Edith is usually given interesting books by Sam.
D. Sam is usually given interesting books to Edith.

5) Where did she find the book?
A. Where is the book found?
B. Where has been found the book?
C. Where was the book found?
D. Where was found the book?

6) The news has surprised us all.
A. We all have surprised with the news.
B. We all were surprised with the news.
C. We all are surprised with the news.
D. We all have been surprised with the news.

7) Joan regularly reads Reader's Digest.
A. Reader's Digest was regularly read by Joan.
B. Reader's Digest has regularly been read by Joan.
C. Joan is regularly read by Reader's Digest.
D. Reader's Digest is regularly read by Joan.

8) Where did he put the suitcase?
A. Where did the suitcase put by him?
B. Where was the suitcase put?
C. Where has the suitcase been put by him?
D. Where was the suitcase putted?

9) Their father's stories usually amuse them.
A. They are usually amused by their father's stories.
B. They are usually amusing by their father's stories.
C. They usually amused by their father's stories.
D. They usually had been amusing by their father's stories.

10) Ben has driven me to the airport.
A. I was drove to the airport by Ben.
B. I have been driven to the airport by Ben.
C. I has been driven to the airport by Ben.
D. Ben has been driven to the airport by me.

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Ответ:
bolshakovatanyoxd2gr
04.03.2022 01:17
Расстояние от точки до прямой - длина перпендикуляра, опущенного из точки на прямую.
Отрезок FB перпендикулярен плоскости квадрата AВСD, значит перпендикулярен прямым АВ, ВС и BD, лежащим в плоскости. Так как отрезок FB пересекает их, то  расстояние до сторон АВ и ВС, а так же и до диагонали BD равно длине отрезка FB и равно 8 дм.

ВА⊥AD как стороны квадрата,
ВА - проекция наклонной FA на плоскость АВС, значит
FA⊥AD по теореме о трех перпендикулярах.
Значит, FA - расстояние от точки F до прямой AD.
Из ΔABF по теореме Пифагора:
FA = √(AB² + FB²) = √(16 + 64) = √80 = 4√5 (дм)

ВС⊥CD как стороны квадрата,
ВС - проекция наклонной FС на плоскость АВС, значит
FС⊥СD по теореме о трех перпендикулярах.
Значит, FС - расстояние от точки F до прямой СD.
ΔАBF = ΔCBF по двум катетам (АВ = ВС как стороны квадрата, BF - общая), тогда
FC = FA = 4√5 дм.

ВО⊥АС, так как диагонали квадрата перпендикулярны,
ВО - проекция FO на плоскость АВС, значит
FO⊥AC по теореме о трех перпендикулярах.
FO - расстояние от точки F до прямой АС.
ВО = BD/2 = 4√2/2 = 2√2 дм как диагональ квадрата,
Из ΔFBO по теореме Пифагора:
FO = √(FB² + BO²) = √(64 + 8) = √72 = 6√2 дм

d(F ; AB) = d(F ; BC) = d (F ; BD) = 8 дм
d(F ; AD) = d(F ; CD) = 4√5 дм
d(F ; AC) = 6√2 дм
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Ответ:
angel3530
19.02.2022 06:28
(без рисунка)
Пусть АВСД - данная трапеция с бОльшим основанием АД и меньшим - ВС. МН - средняя линия. Точку пересечения диагонали АС и средней линии МН обозначим как О.
Положим ВС - х см, тогда АД - (х+6) см. Поскольку длина средней линии трапеции равна полусумме оснований, имеем уравнение:
х+х+6=2*7
2х=8
х=4, следовательно, ВС=4см, а АД=4+6=10см.
Рассмотрим треугольник ВАС.
МО (по теореме Фалеса) является его средней линией и МО=ВС/2=4/2=2см.
Исходя из того, что МН=МО+ОН, находим ОН=7-2=5см.
ответ: 2 см и 5 см.
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