如何计算扇形圆心角的度数

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select * from tbl_Articles WHERE ArticleID=2155712 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2155712 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2155712 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1111590,1047637,1066426,1062696,1107160,1107789,1106360,999216,1085390,1079978,1089058,1042114,1106308,1086498,1054676,1094661,986336,1086122,1072739,1054610,1042020,1050917,1062078,1492702,1073568,1081277,1070000,1048506,1112160,1092367) ORDER BY field (ArticleID,1111590,1047637,1066426,1062696,1107160,1107789,1106360,999216,1085390,1079978,1089058,1042114,1106308,1086498,1054676,1094661,986336,1086122,1072739,1054610,1042020,1050917,1062078,1492702,1073568,1081277,1070000,1048506,1112160,1092367)