*11.15 (Area of a convex polygon) A polygon is convex if it contains any line segments that connects two points of the polygon. Write a program that prompts the user to enter the number of points in a convex polygon, enter the points clockwise, then displays the area of the polygon. For the formula for computing the area of a polygon, see http://www.mathwords.com/a/area_convex_polygon.htm. Here is a sample run of the program:

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