如何量出一个圆形的长度

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select * from tbl_Articles WHERE ArticleID=1308802 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1308802 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1308802 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1111870,1092139,1050843,1070088,1058415,1048506,1107160,1108171,1073846,1062062,1089962,1106647,1087793,1065917,1078262,1102770,1055678,1071393,1065739,1091197,1097505,1079978,1050367,1074492,1082203,1083995,1073503,1077976,1087523,1101193) ORDER BY field (ArticleID,1111870,1092139,1050843,1070088,1058415,1048506,1107160,1108171,1073846,1062062,1089962,1106647,1087793,1065917,1078262,1102770,1055678,1071393,1065739,1091197,1097505,1079978,1050367,1074492,1082203,1083995,1073503,1077976,1087523,1101193)