(Geometry: area of a triangle) Write a program that prompts the user to enter three points, (x4, y1), (x2, y2), and (x3, y3), of a triangle then displays its area. The formula for computing the area of a triangle is Ava" S (side1 + side2 + side3)/2; area = Vs(s side 1)(s - side2)(s Here is a sample run: side3) Enter the coordinates of three points separated by spaces like x1 y1 x2 y2 x3 y3: 1.5 -3.4 4.6 5 9.5 -3.4 The area of the triangle is 33.6