note 51507 added to function.pi

If you want to get your answer in degrees instead of radians, use the following code. <?php $Result = acos($X); $Result = ($X*180)/M_PI; echo "The arc cosine of X in degrees is $Result"; ?> ---- Manual Page -- http://www.php.net/manual/en/function.pi.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+51507 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+51507&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+51507&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+51507&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+51507&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+51507&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+51507&report=yes Search -- http://master.php.net/manage/user-notes.php