public Quadrilateral(Point a, Point b, Point c, Point d)

give assigned values to vertices array in order, invoke superclass constructor using super word and assign a value.

create perimeter function to return sum of 4 vertices and invoke this function create area function from the 4 vertices

Vertex_1 = A, Vertex_2 = B, Vertex_3 = C, Vertex_4 = D Formula = (Area of Triangle 'ABD') + (Area of Triangle 'BCD')