Geography The ground distance between two places is 100km. if the distances is represented by 5cm on a map. what is the scale of the map​

Afootpath is to be constructed in a park in the shape of a parallelogram. when a coordinate plane is laid over a map of the park, the vertices of the footpath are (-4,2) (8,2) (11,7) and (-1,7). what is the perimeter of this path