Sphere kukho into zejometri ngokugqibeleleyo ngeenxa kwi-amathathu onamacala isithuba ukuba umphezulu ibhola ngeenxa ngokupheleleyo. A nqanaba echazwe ngokwezibalo ngokuba iseti iingongoma zonke ezo r kumgama enye evela kwindawo ethile. Formula for umthamo lomoya: , R - kumgama lomoya
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Khuphela ne Cola oku ikhowudi kwi sayithi yakho ukuya kwindawo apho ufuna sokubala ukubonisa.