Umwirondoro wibyuma, nkuko izina ribigaragaza, ni ibyuma bifite imiterere ya geometrike, bikozwe mubyuma binyuze mukuzunguruka, umusingi, guta nibindi bikorwa. Kugirango uhuze ibyifuzo bitandukanye, byakozwe mubice bitandukanye nka I-ibyuma, H ibyuma, Ang ...
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