如何求一个正三棱柱的外接圆直径

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select * from tbl_Articles WHERE ArticleID=2926890 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2926890 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2926890 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1069221,1103022,1084307,1103780,1094015,1102328,1107997,1087813,1091757,1108141,1103971,1083100,1108171,1062130,1084081,1074843,1086194,1101527,1066924,1080235,1063799,1061610,1103037,1097975,1110896,1016441,1099865,1110195,1093479,1077533) ORDER BY field (ArticleID,1069221,1103022,1084307,1103780,1094015,1102328,1107997,1087813,1091757,1108141,1103971,1083100,1108171,1062130,1084081,1074843,1086194,1101527,1066924,1080235,1063799,1061610,1103037,1097975,1110896,1016441,1099865,1110195,1093479,1077533)