Eyodwa: insimbi yesigaba. Ngokwesimo sesigaba, singahlukaniswa ngensimbi eyindilinga, insimbi eyisicaba, insimbi yesikwele, insimbi ene-hexagonal, insimbi ye-octagonal, insimbi ye-angle, i-I-beam, insimbi yesiteshi, insimbi emise okwe-T, insimbi emise okwe-B, njll. Okwesibili: Ipuleti lensimbi! Ipuleti lensimbi eliwugqinsi (ubukhulu $% mm) nensimbi ezacile ...
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