怎么求圆的面积

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select * from tbl_Articles WHERE ArticleID=805763 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=805763 LIMIT 0,1
select * from tbl_Articles_sphinx where id=805763 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(461149,1122419,690249,801710,1096206,1044375,1150095,615287,1925651,1115384,1096675,679648,2111923,1207794,774106,539857,975111,506925,1025424,1002693,1065410,1101311,2976915,660295,520383,618943,914148,435867,1304557,161621) ORDER BY field (ArticleID,461149,1122419,690249,801710,1096206,1044375,1150095,615287,1925651,1115384,1096675,679648,2111923,1207794,774106,539857,975111,506925,1025424,1002693,1065410,1101311,2976915,660295,520383,618943,914148,435867,1304557,161621)