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BISECTOAREA
unui unghi
• BISECTOAREA unui
unghi propriu este
semidreapta cu
originea în vârful
unghiului, situată în
interiorul acestuia,
care formează cu
laturile unghiului
iniţial două unghiuri
congruente.
M
O
N
P
Bisectoarea unghiului obtuz
• Dacă
m(<RTS)=m(<STV)
atunci [TS este
bisectoarea unghiului
< RTV
R S
V
T
Bisectoarea unghiului drept
• Dacă m(<AOB)=90°
şi [OC este bisectoarea
< AOB, atunci
m(<AOC)=m(<BOC)
= 45°
A
O B
C
Bisectoare-proprietăţi
• TEOREMĂ 1 .Dacă un
punct aparţine bisectoarei
unui unghi, atunci
distanţele de la un punct la
laturile unghiului sunt
egale.
• Orice punct care aparţine
bisectoarei unui unghi este
egal depărtat de laturile
acestuia
O
E
F
P
A
B
X
Bisectoare-proprietăţi
• TEOREMA 2. Dacă
distanţele de la un punct la
laturile unui unghi sunt egale ,
atunci punctul aparţine
bisectoarei unghiului.
• Ipoteză :TS⊥PK, TQ⊥PL
iar[TS] ≡ [TQ] .
• Concluzie :<KPT ≡ <LPT
adică [PT este bisectoarea
<KPL
P
S
Q
T
K
L
Bisectoare-proprietăţi
• TEOREMA 2. Dacă
distanţele de la un punct la
laturile unui unghi sunt egale ,
atunci punctul aparţine
bisectoarei unghiului.
• Ipoteză :TS⊥PK, TQ⊥PL
iar[TS] ≡ [TQ] .
• Concluzie :<KPT ≡ <LPT
adică [PT este bisectoarea
<KPL
P
S
Q
T
K
L

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Bisectoareaunuiunghiclsvi

  • 1. BISECTOAREA unui unghi • BISECTOAREA unui unghi propriu este semidreapta cu originea în vârful unghiului, situată în interiorul acestuia, care formează cu laturile unghiului iniţial două unghiuri congruente. M O N P
  • 2. Bisectoarea unghiului obtuz • Dacă m(<RTS)=m(<STV) atunci [TS este bisectoarea unghiului < RTV R S V T
  • 3. Bisectoarea unghiului drept • Dacă m(<AOB)=90° şi [OC este bisectoarea < AOB, atunci m(<AOC)=m(<BOC) = 45° A O B C
  • 4. Bisectoare-proprietăţi • TEOREMĂ 1 .Dacă un punct aparţine bisectoarei unui unghi, atunci distanţele de la un punct la laturile unghiului sunt egale. • Orice punct care aparţine bisectoarei unui unghi este egal depărtat de laturile acestuia O E F P A B X
  • 5. Bisectoare-proprietăţi • TEOREMA 2. Dacă distanţele de la un punct la laturile unui unghi sunt egale , atunci punctul aparţine bisectoarei unghiului. • Ipoteză :TS⊥PK, TQ⊥PL iar[TS] ≡ [TQ] . • Concluzie :<KPT ≡ <LPT adică [PT este bisectoarea <KPL P S Q T K L
  • 6. Bisectoare-proprietăţi • TEOREMA 2. Dacă distanţele de la un punct la laturile unui unghi sunt egale , atunci punctul aparţine bisectoarei unghiului. • Ipoteză :TS⊥PK, TQ⊥PL iar[TS] ≡ [TQ] . • Concluzie :<KPT ≡ <LPT adică [PT este bisectoarea <KPL P S Q T K L