#### Herons Formula

d
```package com.thealgorithms.maths;

/**
* Wikipedia for HeronsFormula => https://en.wikipedia.org/wiki/Heron%27s_formula
* Find the area of a triangle using only side lengths
*/

public final class HeronsFormula {

/*
* A function to get the Area of a Triangle using Heron's Formula
* @param s1,s2,s3 => the three sides of the Triangle
* @return area using the formula (√(s(s – s1)(s – s2)(s – s3)))
* here s is called semi-perimeter and it is the half of the perimeter (i.e; s = (s1+s2+s3)/2)
* @author satyabarghav
*/
private HeronsFormula() {
}

private static boolean areAllSidesPositive(final double a, final double b, final double c) {
return a > 0 && b > 0 && c > 0;
}

private static boolean canFormTriangle(final double a, final double b, final double c) {
return a + b > c && b + c > a && c + a > b;
}

public static double herons(final double a, final double b, final double c) {
if (!areAllSidesPositive(a, b, c) || !canFormTriangle(a, b, c)) {
throw new IllegalArgumentException("Triangle can't be formed with the given side lengths");
}
final double s = (a + b + c) / 2.0;
return Math.sqrt((s) * (s - a) * (s - b) * (s - c));
}
}
```