Complete the following method that calculates and returns the area of a triangle using heron's formula. to use heron's formula, first calculate half of the perimeter of the triangle, and store it in a variable named s. then calculate s(s - a)(s - b)(s - c), where a, b, and c are the lengths of the sides of the triangle, and the values are multiplied. the area is then the square root of that value.(10 points) the perimeter of a triangle is the sum of the lengths of the sides. public static double area(double side1, double side2, double side3) { }