Tse ka Hare
Khatisong ena, re tla tšohla mokhoa oa ho bala pherimitha ea triangolo le ho sekaseka mehlala ea ho rarolla mathata.
Foromo ea potoloho
Pherimitha (P) ea khutlotharo efe kapa efe e lekana le kakaretso ea bolelele ba mahlakore ohle a eona.
P = a + b + c
Pherimitha ea khutlotharo ea isosceles
khutlotharo ea isosceles ke khutlotharo eo mahlakore a eona a mabeli a lekanang (a re nke joalo ka b). Lehlakore a, e nang le bolelele bo fapaneng le ba mahlakoreng, ke motheo. Kahoo, perimeter e ka baloa ka tsela e latelang:
P = a + 2b
Pherimitha ea khutlotharo e lekanang
Ho bitsoa khutlotharo e lekanang kapa e nepahetseng, eo mahlakore ohle a lekanang (a re e nke joalo ka a). Perimeter ea palo e joalo e baloa ka tsela e latelang:
P = 3a
Mehlala ea mesebetsi
Mosebetsi 1
Fumana pherimitha ea kgutlotharo haeba mahlakore a eona a lekana: 3, 4 le 5 cm.
Qeto:
Re kenya palo e tsejoang ke maemo a bothata sebakeng sa foromo ebe re fumana:
P=3cm+4cm+5cm=12cm.
Mosebetsi 2
Fumana pherimitha ea khutlotharo ea isosceles haeba motheo oa eona o le 10 cm mme lehlakore la eona ke 8 cm.
Qeto:
Joalo ka ha re tseba, mahlakore a kgutlotharo ya isosceles a lekana, ka hona:
P = 10 cm + 2 ⋅ 8 cm = 26 cm.