src/Line.php
public function getLength(DistanceInterface $calculator): float
    {
        return $calculator->getDistance($this->point1, $this->point2);
    }
public function getLength(DistanceInterface $calculator): float
    {
        return $calculator->getDistance($this->point1, $this->point2);
    }
Calculates the length of the line (distance between the two
coordinates).

@param DistanceInterface $calculator instance of distance calculation class

@return float