find the surface area of a regular polygon inscribed in a pyramid in php

main.php
<?php
// define the number of sides of the polygon and the pyramid
$n = 4; // for a square pyramid
$s = 10; // length of each side of the square base
$h = 15; // height of the pyramid

// calculate the height of the triangular faces
$tan = tan(360 / (2 * $n) * pi() / 180); // tangent of half the angle between adjacent sides
$face_h = sqrt(1 + pow($tan, 2)); // height of each triangular face
$face_s = $s * $face_h / 2; // area of each triangular face

// calculate the total surface area of the pyramid
$base_s = pow($s, 2); // area of the square base
$total_s = $base_s + ($n * $face_s); // sum of the base and all triangular faces

// output the result
echo "The surface area of the pyramid is $total_s square units.";
?>
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