Inkokora ya dogere 90 ni ubwoko bwinkokora ifite inguni ya dogere 90, ikoreshwa cyane cyane muguhindura icyerekezo cyumuyoboro.Ubusanzwe ikoreshwa muri sisitemu y'imiyoboro aho hasabwa impande enye zikomeye, nko mugihe ibindi bikoresho byumuyoboro bigomba guhuzwa mbere cyangwa nyuma yo kugonda.
