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@ 2018-10-23T12:14:39Z

<?php
function s($rad){
   return M_PI*(pow($rad/2,2));
}
$r1=4;
$r2=10;
$r3=22;
echo s($r1)."<br>";
$a=$r2;
echo s(a)."<br>";
echo s(22);
?>

Output
Performance
VLD
References
Branches

pow: documentation ( source)

preferences:dark modelive preview

58.45 ms | 402 KiB | 5 Q