Bài 1 định lí talét, định lý đảo và hệ quả của định lý ta lét

It’s full of iron oxide dust Mars Mercury is the closest planet to the Sun and the smallest of them all Mercur y 9TH GRADE... Mercury is the closest planet to the Sun and the smallest on

Bài 1:Đ nh lý Talet trong tam giác ị

c) ĐN: Tỉ số của hai đoạn thẳng là tỉ số độ dài của chúng theo cùng một đơn vị đo.

- Tỉ số của hai đoạn thẳng AB và CD được kí hiệu là 

AB CD

'

D C

B A

( = )

CD

AB

' '

'

'

D C

ĐN: Hai đo n th ng AB và CD g i là t l v i hai đo n th ng A’B’ và C’D’ n u có t l ạ ẳ ọ ỉ ệ ớ ạ ẳ ế ỉ ệ

th c: ứ

CD

AB

' '

'

'

D C

=

3 Đ nh lý Talét trong tam gác ị

A

- Vì các đ ng k ngang trên trang v là ườ ẻ ở

nh ng đ ng th ng song song cách đ u ữ ườ ẳ ề

- C ác đo n th ng liên ti p trên các đo n ạ ẳ ế ạ

và

a) ?5

Đ NH LÍ Đ O VÀ H QU C A Đ NH LÍ TA-LÉT Ị Ả Ệ Ả Ủ Ị

4 Đ nh lí ị đ o: ả A

C B

a

b) V ẽ đư ng th ng a ờ ẳ đi qua B' và song song v i BC, ớ đư ng th ng a c t AC t i ờ ẳ ắ ạ đi m C'' ể Tính AC''

* Đ nh lí Ta-lét ị đ o: ả

N u m t ế ộ đư ng th ng c t hai c nh c a m t tam giác và ờ ẳ ắ ạ ủ ộ

đ nh ra trên hai c nh này nh ng ị ạ ữ đo n th ng t ạ ẳ ương ng t l thì ứ ỉ ệ

đư ng th ng ờ ẳ đó song song v i c nh còn l i c a tam giác ớ ạ ạ ủ

1 2 1 2

AM

MB NC AN

Theo đ nh lí Ta-lét ị đ o ta có: MN BC ả

* Đ nh lí Ta-lét ị đ o: ả

10 5

a) Trong hình đã cho có bao nhiêu c p ặ đư ng th ng ờ ẳ

song song v i nhau? ớ

E A

C

E D

x

5,2

D C

O

F

2 3

KI N TH C TR NG TÂM Ế Ứ Ọ

KI N TH C TR NG TÂM Ế Ứ Ọ

BÀI T P VÀ CÁC Ậ

D NG TOÁN Ạ

9TH GRADE

-SOMEONE FAMOUS

“This is a quote Words full of

wisdom that someone important

said and can make the reader

get inspired.”

9TH GRADE

Mercury’s name has nothing to do with the

liquid metal since it was named after the

Roman god, Mercury

WHOA!

9TH GRADE

You can describe the topic

of the section here

9TH GRADE

01

● You can organize your ideas clearly

● You’ll never forget to buy milk!

And the most important thing: the

audience won’t miss the point of

your presentation

9TH GRADE

Big numbers catch your audience’s

attention

560,8

90

9TH GRADE

DO YOU NEED A MAP?

Despite being red, Mars

is a cold place It’s full of

iron oxide dust

Mars

Mercury is the closest

planet to the Sun and the

smallest of them all

Mercur

y

9TH GRADE

A PICTURE IS WORTH A

THOUSAND WORDS

9TH GRADE

Mercury is the

closest planet to the

Sun and the

smallest one

Saturn

Saturn is the ringed planet It’s composed mostly of

hydrogen

Neptune

Neptune is the largest and farthest planet from the Sun DID YOU KNOW THIS?

Venus

Venus has a

beautiful name and

is the second planet

Mars

Despite being red, Mars is actually a cold place, not hot

Jupiter

Jupiter is a gas giant and the biggest planet in our System

9TH GRADE

AWESOME

WORDS

Impress your audience

9TH GRADE

Venus has a beautiful

name and high

temperatures

Venus

Neptune is the farthest

planet from the Sun

Neptune

Despite being red, Mars

is actually a cold place

Mars

9TH GRADE

Venus has a beautiful name

and is the second planet

INFOGRAPHIC

Mars

Despite being red, Mars is

surprisingly a cold place

Venus has a beautiful name

and is the second planet

DEFINITION OF CONCEPTS

Mars

Despite being red, Mars is

actually a cold place

9TH GRADE

Mars

Neptune is the

farthest planet from

the Sun and the

fourth-largest

Mercury

Mercury is the closest planet to the Sun and the smallest of them

all

Saturn

Saturn is the ringed planet It’s composed mostly of hydrogen

HISTORY OF ALGEBRA

Venus has a beautiful name, and it’s terribly hot

Saturn is composed

of hydrogen, helium and hydrogen

Despite being red, Mars is surprisingly

a very cold planet

Mercury is the smallest planet of

them all

9TH GRADE

Insert your multimedia content here

MULTIMEDIA

Mercury’s name has nothing to do

with the liquid metal since it

was named after the Roman god

It is the smallest planet of them

all

9TH GRADE

Saturn Mars Jupiter

Venus Neptune

Saturn is the

ringed planet color, Mars is Despite its biggest planetJupiter is the

cold

Venus has a beautiful name

Neptune is the farthest planet

9TH GRADE

REVIEW THE CONCEPTS

Mercury

Mercury is the closest

planet to the Sun and

the smallest of them all

Saturn

Saturn is the ringed planet It’s composed mostly of hydrogen

9TH GRADE

FIGURES AT A

GLANCE

9TH GRADE

Saturn is the planet with rings

Mercury is the closest planet to the Sun

80,000 50,000 300,000

Mercury

Venus

Mars

Neptune Jupiter

LEARN THE PROCESS

9TH GRADE

Mercury is the closest planet to the Sun

Venus has a beautiful

name and it’s hot

Despite being red,

Mars is actually cold

Neptune is the farthest planet from

the Sun

It’s a gas giant and the biggest planet

0 1

0 3

0

2 0 4

0 5

PRACTICAL EXERCISES

a c

x

h b a

Mercury is the closest planet to the Sun and the smallest one

Saturn is the ringed planet

It’s composed mostly of hydrogen

THEORETICAL ANSWERS

2+4×7−1=?

Neptune is the

farthest planet

from the Sun

and the

fourth-largest

9TH GRADE

SOLVE THE TASKS

Write your answer here

Write your answer here

Write your answer here

v x

?

9TH GRADE

Venus has a beautiful

name and is the

second planet from

the Sun It’s terribly

hot—even hotter than

Mercury

Solution

Mercury is the closest planet to the Sun and the smallest one it’sonly a bit larger than

our Moon

9TH GRADE

OUR TEAM

Ana Smith

You can talk about

this person here

TABLET

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screen with your own work Just

delete this one, add yours and

center it properly

9TH GRADE

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You can replace the image on

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Just delete this one, add yours

and center it properly

9TH GRADE

DESKTOP

MOCKUP

You can replace the image on the

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delete this one, add yours and

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9TH GRADE

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9TH GRADE

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