Get the area of a quadrilateral - Java Quiz Question

Write a program to get the area of a quadrilateral. Points are given in anti clock wise direction starting from bottom left point.

Input (Point, Point, Point, Point)	Output (double)
`[5, 2], [10, 2], [10, 5], [5, 5]`	15.0
`[0, 0], [5, 0], [5, 5], [0, 5]`	25.0
`[5, 2], [9, 2], [9, 4], [7, 4]`	6.0
`[2, 1], [8, 1], [9, 8], [6, 6]`	24.5
`[-8, 1], [-5, 1], [-4, 4], [-7, 4]`	9.0


			

			class AreaOfAQuadrilateral 
 { 

			    public static void main(String s[])
    {
        Point firstPoint = new Point(5, 2);
        Point secondPoint = new Point(10, 2);
        Point thirdPoint = new Point(10, 5);
        Point fourthPoint = new Point(5, 5);
        System.out.println("Area of a quadrilateral : " + areaOfAQuadrilateral(firstPoint, secondPoint, thirdPoint, fourthPoint));

    }
 
			

			

					    public static double areaOfAQuadrilateral(Point firstPoint, Point secondPoint, Point thirdPoint, Point fourthPoint) {


					    } 

			
}
			

					class Point { 

					 

					double x; 

					double y; 

					 

					Point(double x, double y) { 

					this.x = x; 

					this.y = y; 

					} 

					}

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