Last night, I didn't order milkshake because I wasn't thirsty

How much time do you spend on math homework each day?

Eating fruits and vegetables is the healthiest way to stay fit

Question 1: I’m interested in taking part in a clean-up event this month. (fancy)

I fancy taking part in a clean-up event this month

Question 2: The bookshelves are as high as the windows. (same)

The bookshelves are the same height as the windows

Question 3: Let’s collect old plastic bottles and paper in our school. (why)

Why don't we collect old plastic bottles and paper in our school?

Question 4: My friends go to the studio to practice dancing. I do it too. (and)

My friends go to the studio to practice dancing and so do I

1 We planted trees together in the community garden a month ago

2 Her voice is as beautiful as a melody from a fairy tale

3 We have a school assembly in the school yard on Monday mornings.

My sister loves painting. She paints every weekend in her room. She likes to use bright colours and paint flowers and animals. Sometimes, she goes to art classes to learn new techniques. Her favourite colour is blue, so she often paints the sky. Her paintings are very beautiful. I enjoy watching her paint because she is very creative and happy when she is working on her art.

1 Reuse means using something again instead of throwing it away

2 Did your school organise a donation drive last winter?

1 My mother is fond of going jogging in the morning

2 My sister finds it difficult to lift weights

3 We collected plastic bottles and sent them to the factory

Bài 11:

Ta có: \(\hat{B A C} + \hat{A B D} = 12 3^{0} + 5 7^{0} = 18 0^{0}\)

mà hai góc này là hai góc ở vị trí trong cùng phía

nên a//b

Ta có: a//b

d⊥a

Do đó: d⊥b

Bài 12: Ta có: \(\hat{x^{'} A B} + \hat{A B y^{'}} = 13 0^{0} + 5 0^{0} = 18 0^{0}\)

mà hai góc này là hai góc ở vị trí trong cùng phía

nên xx'//yy'

=>\(\hat{x^{'} A B} = \hat{y B A}\) (hai góc so le trong)

=>\(\hat{y B A} = 5 0^{0}\)

Ta có: tia By nằm giữa hai tia BA và BC

=>\(\hat{y B A} + \hat{y B C} = \hat{A B C}\)

=>\(\hat{y B C} = 9 0^{0} - 5 0^{0} = 4 0^{0}\)

Ta có: \(\hat{y B C} = \hat{B C z} \left(\right. = 4 0^{0} \left.\right)\)

mà hai góc này là hai góc ở vị trí so le trong

nên yy'//zz'

=>xx'//yy'//zz'

Bài 13:

a: Ta có: \(\hat{x M N} + \hat{M N y} = 6 0^{0} + 12 0^{0} = 18 0^{0}\)

mà hai góc này là hai góc ở vị trí trong cùng phía

nên Mx//Ny

b: Mx//Ny

Ny//Pz

Do đó: Mx//Pz

c: Ny//Pz

=>\(\hat{N P z} = \hat{y N P}\) (hai góc so le trong)

=>\(\hat{y N P} = 14 0^{0}\)

Ta có: \(\hat{y N P} + \hat{y N M} + \hat{M N P} = 36 0^{0}\)

=>\(\hat{M N P} = 36 0^{0} - 14 0^{0} - 12 0^{0} = 10 0^{0}\)

Bài 14:

Qua E, kẻ tia EA nằm giữa hai tia ED và EF sao cho EA//Dx//Fy

EA//Dx

=>\(\hat{x D E} = \hat{D E A}\) (hai góc so le trong)

=>\(\hat{D E A} = 5 5^{0}\)

Ta có: Fy//EA

=>\(\hat{A E F} = \hat{E F y}\) (hai góc so le trong)

=>\(\hat{A E F} = 4 0^{0}\)

Ta có: tia EA nằm giữa hai tia ED và EF

=>\(\hat{D E F} = \hat{D E A} + \hat{A E F}\)

\(= 5 5^{0} + 4 0^{0} = 9 5^{0}\)

hello