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‫ال ّرس 3: المثّثات المتقايسة‬
‫ل‬
‫د‬
1

‫1 المثّثات المتقايسة ال ّوايا‬
‫ز‬
‫ل‬

A

F
G

AC 
BC

AB 
BC 
 AC 

E

E

AD 

BC

ABC
1
2

AEF

FGC

G

E

F

3

E

AC 

FGC

ABCD



E

AEF
2

‫حاالت تقايش المثّثات العا ّة‬
‫م‬
‫ل‬

E

F

2

A

G

C

B

EFG

ABC
E

F

BC
AB 

AC 

A

I

ABC

 AB 
BC 

I

I

ˆ
ˆ
AIF  ICE

1

ˆ
CIE  90

IAF

AC 
BI 

D

2

CIE

ABC

I

BC 

A

ˆ
ˆ
IAD  ICB
ˆ
ˆ
AID  BIC
IAD

1
2

IBC

3
4
3

G
A

E

F

B

C

EFG

ABC

ABCD

AE 

B

ˆ
ˆ
DAB  CBE

E
1

ABD

2

BEC
3

ABCD

BC

AI  JC
JCD

J

AD 

AIB

I
1
2

IBJD

3
4

G
A

E

B

F

C

EFG

ABC

AB 



BCD

D C

ACD

1
2

AB 

4
2

A

C

3

B

C'

N
ANB

M

AMB

C'

C
1
AB 

ˆ
MA N

2
5

ABCD

AC 

AM  CN

M

N

ABM
ˆ
ˆ
BMN  MND

NCD

1
2

ND BM 

ABCD

AD 

AC 
BC  EO 
E

F
OFC

O
1

AEO

EF 

O

2
6

‫حاالت تقايش المثّثات القائمة‬
‫ل‬

3

C
G

E

F

A

B

EFG

ABC

ABCD

BC 
 AD 
ˆ
ˆ
ABE  FDC

A
C

E
F
1
ABE

2

CFD
3

ABCD

A

AM 
CN 

ABD

C

CBD
ˆ
ˆ
ABM  NDC

1

ABM

CND

2
7

C
G

E

F

A

B

EFG

ABC

C

O

ˆ
AOB

M

B

'

C

B
A

MBO MAO

A


C
1
2

A
E

C

 AC 

B
ACE

ABC

 AB 
ABE

1
2
8
‫المثّثات المتقايسة ال ّلعين‬
‫ض‬
‫ل‬

A

4

ABC

BC

I

ABI

AIC

1

A

C

B

ˆ
ACB

ˆ
ABC

A

ABC

BC

AB 
AC 

I
E

I

F

I

IEB

IFC

1

AE  AF

2

ABCD

DC 

BE  DF
ADF

F

ABE

BC

E
1

CEF

2

EF 

 AC 

3
9

A

ABC
BC

I

BC

AIB

AIC

Ax 

ˆ
BAC

1

 AI 

2
2

A

ABC

AC  AB 
EF 
 AI 

AE  AF

BC

F

E

I
1

ˆ
ˆ
EAI  IAF

BC

 AI 
EF //BC 

2

10

ˆ
ˆ
ABC  ACB

BC

I

ABC

ˆ
BAC

ˆ
ˆ
AIB  AIC
AIC

1

AIB

2

ABCD

AD 
AE  DF
ˆ
ˆ
AEB  DFC
IEF

F

CF  BE 

I

IBC

E
1
2
3

A

ABC

I

BC

ˆ
BAC
 AI   BC 
E

 AB 

1

BC 
 AI  //CE 

C

2

ABC

11

‫المثّثات المتقايسة األضالع‬
‫ل‬

5

60

60

ABC

B

A

E

A

C

F
AEF
12

‫من ّف زاوية‬
‫ص‬

ˆ
xAy

M

Ay  Ax 

M

K

AMK

AMH

y
K
z
M
A

H

x

6

H
MK

MH

ABC

ˆ
ACB

I

 AC   AB  BC 

ˆ
ABC

I

G

F E

IE  IF  IG

y
K
z
M
A

H

x

Ay  Ax 

M

A
ABC

M

ABC

BF  CE 
ˆ
ˆ
FBC  ECB

FB EC

ME  MF
ˆ
BAC

AM 

1

M

2

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Cours1

  • 1. ‫ال ّرس 3: المثّثات المتقايسة‬ ‫ل‬ ‫د‬ 1 ‫1 المثّثات المتقايسة ال ّوايا‬ ‫ز‬ ‫ل‬ A F G AC  BC AB  BC   AC  E E AD  BC ABC 1 2 AEF FGC G E F 3 E AC  FGC ABCD  E AEF 2 ‫حاالت تقايش المثّثات العا ّة‬ ‫م‬ ‫ل‬ E F 2 A G C B EFG ABC
  • 2. E F BC AB  AC  A I ABC  AB  BC  I I ˆ ˆ AIF  ICE 1 ˆ CIE  90 IAF AC  BI  D 2 CIE ABC I BC  A ˆ ˆ IAD  ICB ˆ ˆ AID  BIC IAD 1 2 IBC 3 4 3 G A E F B C EFG ABC ABCD AE  B ˆ ˆ DAB  CBE E 1 ABD 2 BEC
  • 3. 3 ABCD BC AI  JC JCD J AD  AIB I 1 2 IBJD 3 4 G A E B F C EFG ABC AB    BCD D C ACD 1 2 AB  4 2 A C 3 B C' N ANB M AMB C' C 1
  • 4. AB  ˆ MA N 2 5 ABCD AC  AM  CN M N ABM ˆ ˆ BMN  MND NCD 1 2 ND BM  ABCD AD  AC  BC  EO  E F OFC O 1 AEO EF  O 2 6 ‫حاالت تقايش المثّثات القائمة‬ ‫ل‬ 3 C G E F A B EFG ABC ABCD BC   AD  ˆ ˆ ABE  FDC A C E F 1
  • 5. ABE 2 CFD 3 ABCD A AM  CN  ABD C CBD ˆ ˆ ABM  NDC 1 ABM CND 2 7 C G E F A B EFG ABC C O ˆ AOB M B ' C B A MBO MAO A  C 1 2 A E C  AC  B ACE ABC  AB  ABE 1 2 8
  • 6. ‫المثّثات المتقايسة ال ّلعين‬ ‫ض‬ ‫ل‬ A 4 ABC BC I ABI AIC 1 A C B ˆ ACB ˆ ABC A ABC BC AB  AC  I E I F I IEB IFC 1 AE  AF 2 ABCD DC  BE  DF ADF F ABE BC E 1 CEF 2 EF   AC  3 9 A ABC
  • 7. BC I BC AIB AIC Ax  ˆ BAC 1  AI  2 2 A ABC AC  AB  EF   AI  AE  AF BC F E I 1 ˆ ˆ EAI  IAF BC  AI  EF //BC  2 10 ˆ ˆ ABC  ACB BC I ABC ˆ BAC ˆ ˆ AIB  AIC AIC 1 AIB 2 ABCD AD  AE  DF ˆ ˆ AEB  DFC IEF F CF  BE  I IBC E 1 2 3 A ABC I BC ˆ BAC
  • 8.  AI   BC  E  AB  1 BC   AI  //CE  C 2 ABC 11 ‫المثّثات المتقايسة األضالع‬ ‫ل‬ 5 60 60 ABC B A E A C F AEF 12 ‫من ّف زاوية‬ ‫ص‬ ˆ xAy M Ay  Ax  M K AMK AMH y K z M A H x 6 H
  • 9. MK MH ABC ˆ ACB I  AC   AB  BC  ˆ ABC I G F E IE  IF  IG y K z M A H x Ay  Ax  M A ABC M ABC BF  CE  ˆ ˆ FBC  ECB FB EC ME  MF ˆ BAC AM  1 M 2