## Minimal Networks - Steiner's Problem

### Minimal network between four points

Choose four cities in the map by moving points $$A$$, $$B$$, $$C$$ and $$D$$ to the desired location.

(In order to work, the points $$A$$, $$B$$, $$C$$ and $$D$$ should be chosen clockwise.)

To see the minimal (shortest) network of roads that links those four cities, please move the red dot until the points $$X$$ and $$Y$$ overlap. Only then the minimal network will appear automatically.