Before revision: At the same time, six cyclones were discovered at the South Pole: one in the center and five around it (their centers formed a close to regular pentagon), each about 4,500 km (2,800 mi.)
After revision: At the same time, six cyclОnes were discovered at the South Pole: one in the center and five around it (their centers formed a close to regular pentagon), each about 4,500 km (2,800 mi.)