Write a method called triangleArea that accepts the three side lengths of a triangle as pa...

Write a method called triangleArea that accepts the three side lengths of a triangle as parameters and returns the area of a triangle with those side lengths. For example, the call triangleArea (8, 5.2, 7.1) should return 18.151176098258745. To compute the area, use Heron’s formula, which states that the area of a triangle whose three sides have lengths a, b, and c, is the following. The formula is based on the computed value s, a length equal to half the perimeter of the triangle: