圆的周长怎么求

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select * from tbl_Articles WHERE ArticleID=914668 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=914668 LIMIT 0,1
select * from tbl_Articles_sphinx where id=914668 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1108355,3493048,1107333,1939687,799242,1094807,506925,948270,3238806,2661278,1106942,1083528,1091705,1122266,437911,1304475,1117866,1323305,519284,3267626,86937,1122579,1119281,924009,584591,1089596,721365,1075577,1090020,1085346) ORDER BY field (ArticleID,1108355,3493048,1107333,1939687,799242,1094807,506925,948270,3238806,2661278,1106942,1083528,1091705,1122266,437911,1304475,1117866,1323305,519284,3267626,86937,1122579,1119281,924009,584591,1089596,721365,1075577,1090020,1085346)