find the volume of a regular polygon circumscribed around a pyramid in php

main.php
function getRegularPolygonArea($n, $s) {
  // $n is the number of sides
  // $s is the length of each side
  
  $apothem = $s / (2 * tan(pi() / $n));
  $area = ($n * $s * $apothem) / 2;
  return $area;
}
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main.php
function getPyramidHeight($n, $s, $h) {
  $apothem = $s / (2 * tan(pi() / $n));
  $baseSide = 2 * $apothem;
  $baseRadius = $s / (2 * sin(pi() / $n));
  $slantHeight = sqrt(pow($h, 2) + pow($baseRadius, 2));
  
  return $slantHeight;
}
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main.php
function getRegularPyramidVolume($n, $s, $h) {
  $area = getRegularPolygonArea($n, $s);
  $height = getPyramidHeight($n, $s, $h);
  $volume = ($area * $height) / 3;
  
  return $volume;
}
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