Write a program that prompts the user to enter the three points (x1, y1), (x2, y2), and (x3, y3) of a triangle and displays its area. The formula for computing the area of a triangle is s = (side1 +...

Write a program that prompts the user to enter the  three points (x1, y1), (x2, y2), and (x3, y3) of a triangle and displays its area. The formula for computing the area of a triangle is

s = (side1 + side2 + side3) / 2

area =√(s(s - side1)(s - side2)(s - side3))