三角形的底怎么求

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select * from tbl_Articles WHERE ArticleID=1766831 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1766831 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1766831 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3266707,1190077,968587,849748,943056,428999,3460874,1008130,994435,1114262,1097803,1303492,3159514,1142252,3503761,1759592,1104183,1082151,1060698,1090378,1115763,1119067,432448,1085346,392743,935979,2579779,2474998,307737,2082260) ORDER BY field (ArticleID,3266707,1190077,968587,849748,943056,428999,3460874,1008130,994435,1114262,1097803,1303492,3159514,1142252,3503761,1759592,1104183,1082151,1060698,1090378,1115763,1119067,432448,1085346,392743,935979,2579779,2474998,307737,2082260)