(Area of a polygon) Write a program that prompts the user to enter the points of a
convex polygon and display its area. Assume that the polygon has six end points and the points are entered clockwise. For the definition of a convex polygon, see www.mathopenref.com/polygonconvex.html. Hint : The total area of a polygon is the sum of the areas of the small triangles as shown in Figure.

Here is a sample run of the program:

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