Kwerekana ibicuruzwa:
Icyuma kizengurutse ni icyuma gikomeye cya silindrike, diameter irashobora gushushanywa mubunini butandukanye ukurikije umusaruro ukenewe.Inzira yo gutunganya ikubiyemo kuzunguruka, gushushanya ubukonje, guhimba no kuvura ubushyuhe nubundi buryo.Muri byo, kuzunguruka bishyushye nuburyo bukoreshwa cyane, bushobora kubyara ibyuma bizengurutswe na diameter nini.Igishushanyo gikonje gishobora kubyara diameter ntoya nicyuma kizengurutse neza.