find the surface area of a cone in php

main.php
function cone_surface_area($radius, $height) {
  $surface_area = pi() * $radius * ($radius + sqrt(pow($height, 2) + pow($radius, 2)));
  return $surface_area;
}
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main.php
$radius = 5;
$height = 10;

$surface_area = cone_surface_area($radius, $height);

echo "The surface area of the cone is: " . $surface_area;
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main.php
The surface area of the cone is: 219.91148575129
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