From the figure it can be seen that a GREAT CIRCLE is a circle on the surface of a sphere, (earth) the plane of which passes through the sphere's centre, WQGE.
Kumzobo ibonakale ukuba isangqe esikhulu sisangqa ngaphezulu kwengqukumba, (yomhlaba) unqwelontaka edlula emphakathini wengqukumbe, WQGE.