Contents
A cikin wannan ɗaba'ar, za mu yi la'akari da yadda za a lissafta kewayen triangle da nazarin misalan warware matsaloli.
Formula kewaye
kewaye (P) na kowane triangle yana daidai da jimlar tsayin dukkan bangarorinsa.
P = a + b+c
Kewaye na triangle isosceles
Triangle isosceles triangle ne wanda bangarorin biyu suke daidai (bari mu dauke su a matsayin b). Gede a, Samun tsayi daban-daban daga gefen gefe, shine tushe. Don haka, ana iya lissafin kewaye kamar haka:
P = a + 2b
Matsakaicin madaidaicin triangle
Ana kiran madaidaicin madaidaici ko alwatika na dama, wanda dukkan bangarorin suke daidai (bari mu dauke shi a matsayin a). Ana lissafta kewayen irin wannan adadi kamar haka:
P = 3 a
Misalan ayyuka
Aiki 1
Nemo kewayen alwatika idan gefan sa daidai suke: 3, 4 da 5 cm.
Yanke shawara:
Muna maye gurbin adadin da aka sani ta yanayin matsalar cikin tsari kuma mu sami:
P=3cm+4cm+5cm=12cm.
Aiki 2
Nemo kewayen triangle isosceles idan gindinsa ya kai cm 10 kuma gefensa yana da 8 cm.
Yanke shawara:
Kamar yadda muka sani, bangarorin triangle isosceles daidai suke, saboda haka:
P = 10 cm + 2 ⋅ 8 cm = 26 cm.