什么叫三角形的内角

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select * from tbl_Articles_data WHERE ArticleID=1994522 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(378154,86248,713961,1116559,1121863,1119540,386022,446899,1121792,2487143,1455083,1118889,2862383,1101015,381795,1118160,1552757,1807324,1115763,361261,1096549,1085552,1083445,387900,1107390,1139055,1114096,1115339,2808080,1116097) ORDER BY field (ArticleID,378154,86248,713961,1116559,1121863,1119540,386022,446899,1121792,2487143,1455083,1118889,2862383,1101015,381795,1118160,1552757,1807324,1115763,361261,1096549,1085552,1083445,387900,1107390,1139055,1114096,1115339,2808080,1116097)