radijus

1. (in geometry) radius
   Radijus ovog kruga je pet centimetara. — The radius of this circle is five centimetres.
2. (of an area) radius; range
   U radijusu od dva kilometra nema nijedne prodavnice. — There isn't a single shop within a two-kilometre radius.
   Radijus kretanja mu je posle operacije bio ograničen. — After the operation his range of movement was limited.

A common construction is u radijusu od + gen. (u radijusu od 10 km).