ALEA::DISTANCE
Arguments: xo yo x1 y1 [generic-function]
the distance between xo yo and x1 y1
Calculates the Euclidean distance between two points in
the same plane at coordinates xo yo and x1 y1 .
Calculates the Euclidean distance between two points in
the same plane at coordinates xo yo and x1 y1 .
