Kwambuka: Ukwezi Heptagon Impinga
Soma: Kujugunya, Heptagon, Impinga.
Ukwezi kwerekana ubuzima bw'amarangamutima na buri munsi. Vertex cyangwa Vertex yerekana aho nuburyo imbaraga zabaye mubuzima bwambere zizagaragara muri ubu buzima. Uyu mwanya utanga umusanzu mubi bibazo, ariko bike, kuko ari intege nke cyane. Ibindi