SATHI DAVRZANI

SATHI DAVRZANI, sathest, ki dar natijai dar atrofi mehvari beharakat davr zadani yagon khati kaj (tashkilkunanda) hosil meshavad. Nuqtahoi khati kaji tashkilkunanda (t) hangomi davrzani davrahoero hosil mekunand, ki parallelhoi sath nom dorand (rasm).
Paralleli kalontarinro ekvator (a) va khurdtarinro gardanai Sath menomand. Burishi sath bo hamvorie, ki az tiri on meguzarad, meridian (tkh) nom dorad. Hamai meridianhoi sath bayni khud baroba- rand.
Vobasta ba shakl va vaziyati mehvari davrzani sathhoi gunoguni davrzani hosil meshavand: silindr, konus, sfera, paraboloidi davrzani, giperboloidi davrzani, ellipsoidi davrzani, tor (halqa) va gayra.
T. Juraev, V. Yu. Navruzov.