Question

How to calculate the area of a triangle using Heron’s formula in PHP

Answer 1

// Function to calculate area using Heron's formula
function heronArea(float $a, float $b, float $c): float {
    $s = ($a + $b + $c) / 2.0; // semi-perimeter

    return sqrt($s * ($s - $a) * ($s - $b) * ($s - $c));
}

$a = 6; 
$b = 9; 
$c = 13;

// Check validity of triangle
if ($a + $b > $c && $a + $c > $b && $b + $c > $a) {
    $area = heronArea($a, $b, $c);
    echo sprintf("Area of the triangle = %.4f\n", $area);
} else {
    echo "Invalid triangle sides!\n";
}



/*
run:

Area of the triangle = 23.6643

*/

 

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