Wanene a wani lokaci ya zo don nazarin ilimin lissafi dole ne ya fahimci wannan yanayin, kodayake mutum ya san kowane irin siffofin lissafi ta hanyar gama gari, dole ne a yi la'akari da cewa su ma suna da halaye da darajojinsu. Bari mu duba batun alwatika, wanda gwargwadon kusurwarsu da ɓangarorinsa suka sami halaye na musamman. Abin da ya tabo game da wannan shi ne iya ba da taƙaitaccen bitar duk waɗannan azuzuwan da ake da su.
Samun sauƙi game da shi, yana da daraja farawa tare da daidaitaccen alwatika, wanda aka san shi da kasancewar bangarorinsa guda uku da kusurwa, ana iya cewa kusan shine alwatika mai kyau.
Sabanin abin da ke sama, bari mu gani isosceles alwatika, wanda ya ƙunshi bangarori biyu masu daidaita kuma bin wannan layi shine nau'in sikelin, inda bangarorinsa uku da kusurwoyinsa basu daidaita ba.
El sikelin sikelin Yana da ɗayan da ke da dukkan bangarorinsa da tsayi daban-daban.
Kasancewa ɗan takamaiman takamaiman kusurwoyinsa, ana kiran sa m alwatika zuwa ga wanda ke da cikin ciki kusan kusurwa uku, kuma rashin kulawa ga ma'abucin kusurwa mara kyau. Triananan triangle ɗin sune waɗanda suke da ɗayan kusurwoyin cikinsu tsattsage, ma'ana, ya fi 90. Sauran kusurwoyin biyu basu kai 90 ° ba.
A gefe guda, watakila abin da ake kira madaidaicin alwatika, yana da kusurwar dama na digiri 90, ban da gefenta yana karɓar takamaiman sunaye: mafi girma ana kiransa hypotenuse kuma mafi ƙanƙanta ana kiransa ƙafa.