Is a program correctly written that calculates and displays the area of ​​a triangle if its sides are known?

Question

Java

Hello everyone, actually a subject.
There is a variable with values

double a = 0.4;
double b = 0.3;
double c = 0.5;

It is necessary to implement a program according to Heron's formula with the formula Math.sqrt
That's what happened to me

package pack;

public class two {

  public static void main(String[] args) {
    double a = 0.4, b = 0.3, c = 0.5;
    
    double d = Math.sqrt(a * a + b * b + c * c);
    System.out.println("Площадь треугольника равна " +d);
  }
}

Is the code implemented correctly? Thank you for your time!

Answer 1

Not right.
Heron's formula is not the root of the sum of the squares of the sides. Open your math textbook.