Khatisong ena, re tla tšohla lintlha tse ka sehloohong tsa bophahamo ba triangolo ea isosceles, hammoho le ho hlahloba mehlala ea ho rarolla mathata tabeng ena.
Hlokomela: khutlotharo e bitsoa bokamoso, haeba mahlakore a mabeli a eona a lekana (lateral). Lehlakore la boraro le bitsoa motheo.
Bophahamo ba kgutlotharo ya isosceles
Thepa 1
Ho kgutlotharo ya isosceles, mahodimo a mabedi a hulelwang mathokong a a lekana.
AE = CD
Fetola mantsoe: Haeba li-altitude tse peli li lekana ka khutlo-tharo, joale ke isosceles.
Thepa 2
Ho kgutlotharo ya isosceles, bophahamo bo theohetseng botlaaseng ka nako e le 'ngoe ke bisector, median, le perpendicular bisector.
- BD – bophahamo bo huleloang botlaaseng AC;
- BD ke median, joalo AD = DC;
- BD ke karolo e 'meli, kahoo angle α lekana le kgutlo β.
- BD – perpendicular bisector to the side AC.
Thepa 3
Haeba mahlakore / li-angles tsa khutlo-tharo ea isosceles li tsejoa, joale:
1. Bolelele ba bolelele hatheoleloa motheong a, e baloa ka foromo:
- a - lebaka;
- b – lehlakore.
2. Bolelele ba bolelele hbhuleloa ka nqane b, e lekana:
p - ena ke halofo ea pherimitha ea khutlotharo, e baloang ka tsela e latelang:
3. Bophahamo ho lehlakoreng bo ka fumanoa ka sine ya sekhutlo le bolelele ba lehlakore khutlotharo:
Hlokomela: ho kgutlotharo ya isosceles, bophahamo bo akaretsang bo hlahisitsweng kgatisong ya rona – le tsona di a sebetsa.
Mohlala oa bothata
Mosebetsi 1
Ho fanoe ka kgutlotharo ya isosceles, eo motheo oa eona e leng 15 cm, 'me lehlakore ke 12 cm. Fumana bolelele ba bophahamo bo theohetseng botlaaseng.
tharollo
Ha re sebeliseng foromo ea pele e hlahisitsoeng ho Thepa 3:
Mosebetsi 2
Fumana bophahamo bo huleloang lehlakoreng la khutlotharo ea isosceles bolelele ba 13 cm. Motheo oa setšoantšo ke 10 cm.
tharollo
Taba ea pele, re bala semiperimeter ea kgutlotharo:
Joale sebelisa mokhoa o nepahetseng oa ho fumana bophahamo (e emetsoeng ho Thepa 3):
