Ikibaho cyahinduwe na seisimike
Ibisobanuro bigufi:
Igice cya spiral gikomeza igice cya convex hamwe nigice cyihariye gikozwe hejuru ya matrike ya silindrike cyangwa conical.Imitwe igabanijwemo insinga za silindrike hamwe nududodo twa conique ukurikije imiterere yababyeyi;Irashobora kugabanywamo urudodo rwo hanze nu mugozi wimbere ukurikije umwanya wacyo mumubiri wababyeyi, kandi irashobora kugabanywamo urudodo rwa mpandeshatu, urudodo rwurukiramende, urudodo rwa trapezoidal, urudodo rwerekanwe hamwe nizindi nsanganyamatsiko zidasanzwe ukurikije imiterere yicyiciro (imiterere yinyo).
