(Geometry: polygon subareas) A convex 4-vertex polygon is divided into four triangles, as shown in Figure 8.8. V2 (x2, y2) V1 (x1, y1) V3 (x3, y3) V4 (x4, y4) A 4-vertex polygon is defined by four vertices. Write a program that prompts the user to enter the coordinates of the four ver- tices and displays the areas of the four triangles in increasing order. Here is a sample run:

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