sfera

1. sphere; field; area
   Radi u sferi finansija već deset godina. — He has worked in the field of finance for ten years.
   Srbija je bila u sferi ruskog uticaja. — Serbia was in the Russian sphere of influence.
2. (in geometry) sphere
   Izračunaj površinu sfere poluprečnika pet centimetara. — Calculate the surface area of a sphere with a radius of five centimetres.