online_common:   Calculation of the area common to all four inscribed quadrants in a square INPUT DATA: Select:     SI units (metric) U.S. Customary units Side of the square L:       Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinecommon.php on line 99 OUTPUT: Area of the square A:   Warning: Undefined variable $sidesquare2 in /var/www/html/ponce/onlinecommon.php on line 121 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlinecommon.php on line 121 0  Warning: Undefined variable $areaunits in /var/www/html/ponce/onlinecommon.php on line 121 Area common to all four quadrants Ac :   Warning: Undefined variable $areacommon in /var/www/html/ponce/onlinecommon.php on line 122 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlinecommon.php on line 122 0  Warning: Undefined variable $areaunits in /var/www/html/ponce/onlinecommon.php on line 122   Your request was processed at  10:44:41 pm on April 3rd, 2025   [ 250403  22:44:41 ].