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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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