Vidstan mizh dvoma tochkamy v dekartoviy systemi koordinat obchyslyuyetsya za formuloyu vidstani: d = kvadratnyy korin[(x2-x1)2 + (y2-y1)2]. Tsya formula pokhodyт vid teoremy Pifagora. Napriklad, dlya tochok (2, 3) ta (6, 7): d = korin[16 + 16] = korin z 32 pryblyzno 5,66 odynyts. Dlya realnykh geografichnykh zadach vykorystovuyte formulu Haversine dlya vidstaney na sferychniy poverkhni Zemli.