如何求圆的最短弦

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select * from tbl_Articles WHERE ArticleID=1521373 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1521373 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1521373 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1052952,1085912,1080713,1073772,1073302,1052425,1086872,1077490,1072751,1068900,964762,1088878,1103386,1092139,1130184,1041343,1072278,1126226,1032968,1087485,1101929,1051535,1062566,1102022,1063641,1109669,1060817,1086408,1070014,1085616) ORDER BY field (ArticleID,1052952,1085912,1080713,1073772,1073302,1052425,1086872,1077490,1072751,1068900,964762,1088878,1103386,1092139,1130184,1041343,1072278,1126226,1032968,1087485,1101929,1051535,1062566,1102022,1063641,1109669,1060817,1086408,1070014,1085616)