/* P1(a,c) & P2(b,d)
(a,b) are the respective minimum and maximum values of Northern Latitude (LAT_N)
(c,d) are the respective minimum and maximum values of Western Longitude (LONG_W)

Euclidean Distance (2D Plane): square_root( (q1-p1)^2 + (q2-p2)^2 )
*/

select
    round(
        sqrt(
            power(max(LAT_N) - min(LAT_N), 2) + power(max(LONG_W) - min(LONG_W), 2)
            )
        ,4)
from station;