# 4495 подібні трикутники 8 клас

• Published on
11-Jul-2015

• View
2.824

6

Embed Size (px)

Transcript

• - 21

• 2 , 1 0

603

20

.122:

1. .

2. .

3. .

4. .

5*. .

• , .

- , - .

- , - .

, .

• , . , .

• , ,

, .

• , 3, 5, 6 6, 10 , 12 , ?

36

5

12 6

10

.

, .

• -

file:///mnt/temp/unoconv/20131024144317/
• ii i , i ii.

N

8

~

• , 20, - 4, 60

60

20004 =

)(300)(300004602000 ===

60

20004 =

• D BC AD 10 6 . 8 . , .

A

B C

D

• ( )

, ,, .

A

B

C

M

K L

6

16

3

8

, 8-

~

• D

BK

A

CO

, .

!

17

7

2912

• : =2 , AC= 9, =6, =4 ,AK=3. ABC.

P

CB

K

A

• ( ).

,

.

, 8-

• : KLM

AB= 12 KL= 6 BC= 16 LM= 8

AC= 24 KM= 12

:

~KLM

KLM AB BC ACKL LM KM12 16 246 8 12

2 2 2

B

A C K L

M

~KLM( )

• , ??

.

• ( ).

:1), ,

;

2) .

, = 900, -

1) CH2 = AH . BH;2) BC2 = BA . BH; 3) AC2 = AB . AH.

• :

1) : = + 4) : 2 = . = 25 . 2 = 9 . 252) : 2 = . = 3 . 5 2 = 16 . 25 = 15 . = 4 . 5 = 20 .3) : 2 = . 2 = 16 . 9 = 4 . 3 = 12 .

16

9

16 9 . .

• , ., .

• D

; , , ; BD ; DC = 16 , D = 25 . AC, CB, AB, BD.

25 16O

• , .

D

• : ,-,=30,=20,=12:

20

30

12

` : C AP CP

=

30 1220 CP=

CP= 12*2030

24 3 = 8(c)

: = 8

=

• BD , = 24 , = 20 , AD 3 CD.

D

• ,

• . 122 () . 123 651. ()

• ,

• http://migranov.ru/photoalbum/winter/32.php