Matematika. Figūrų ploto skaičiavimas

Array
(
    [0] => stdClass Object
        (
            [id] => 747
            [alias] => imoniu-katalogas-visos-imones
            [type] => 0
            [name] => www.fitingis.lt
            [clickurl] => 0b060901230544e84a96283e2d2ecfc1.jpg
            [cid] => 1830
            [params] => JRegistry Object
                (
                    [data:protected] => stdClass Object
                        (
                        )

                )

            [custombannercode] => 
            [track_impressions] => -1
            [client_track_impressions] => 
        )

)