扇形的周长公式

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(86849,364610,2117866,361035,1149399,1091719,87078,85990,738384,1173320,367663,362129,1083528,1106942,2169245,86751,86847,1117201,1090367,1105379,362699,752581,361281,101051,2661278,777882,369737,362894,1108854,375023) ORDER BY field (ArticleID,86849,364610,2117866,361035,1149399,1091719,87078,85990,738384,1173320,367663,362129,1083528,1106942,2169245,86751,86847,1117201,1090367,1105379,362699,752581,361281,101051,2661278,777882,369737,362894,1108854,375023)