4. Choose the right word or phrase: a) Are they for a bus? waiting seeing driving b) She to the cinema - id1430628520201002 от Maqa11 02.10.2020 04:34

Question

Геометрия: 4. Choose the right word or phrase: a) Are they for a bus? waiting seeing driving b) She to the cinema at the weekend. plays rides goes c) Ellen can t her purse. find watch look d) Would you like some in your tea? jam sugar oil e) She s looked her keys but she can t find them. for at in​

Maqa11 · Accepted Answer

PQ найдём из треугольника АРС
АР = РС = 1
АС = √2 как диагональ квадрата со стороной 1
S(АРС) = 1/2*АР*РС = 1/2*АС*PQ
1*1 = √2*PQ
PQ = 1/√2
---
рис 1
КК₁ является средней линией треугольника QPC, т.к. К - середина РС
КК₁ = 1/2*PQ = 1/(2√2)
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рис 2
КК₂ является средней линией треугольника QPC, т.к. К - середина РС
КК₂ = 1/2*QС = 1/4*АС = 1/(2√2)
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рис 3 в 3Д и рис 4 в плоскости
Гипотенуза PQW
PW = √((1/√2)²+(1/2)²) = √(1/2+1/4) = √(3/4) = √3/2
Площадь треугольника PQW двумя
S(PQW) = 1/2*PQ*QW = 1/2*PW*QZ
1/(2√2) = √3/2*QZ
QZ = 1/√6

Вправильной четырёхугольной пирамиде pabcd с ребром 1 точка q - центр основания, а точка k - середин

Вправильной четырёхугольной пирамиде pabcd с ребром 1 точка q - центр основания, а точка k - середин

4. Choose the right word or phrase:
a) Are they
for a bus?
waiting seeing driving
b) She
to the cinema at the weekend.
plays rides goes
c) Ellen can't
her purse.
find watch look
d) Would you like some
in your tea?
jam sugar oil
e) She's looked
her keys but she can't find them.
for at
in

MOGZ ответил

4. Choose the right word or phrase:a) Are theyfor a bus?waiting seeing drivingb) Sheto the cinema at the weekend.plays rides goesc) Ellen can'ther purse.find watch lookd) Would you like somein your tea?jam sugar oile) She's lookedher keys but she can't find them.for atin​

MOGZ ответил

4. Choose the right word or phrase:
a) Are they
for a bus?
waiting seeing driving
b) She
to the cinema at the weekend.
plays rides goes
c) Ellen can't
her purse.
find watch look
d) Would you like some
in your tea?
jam sugar oil
e) She's looked
her keys but she can't find them.
for at
in