扇形的面积计算公式

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(101050,100648,1091922,2793538,86751,2964226,3303702,1114916,100495,641802,368911,1114376,359340,1490605,924009,1114510,1096549,86926,628227,988279,100539,1449256,3108368,1114198,2079076,3067500,86831,1114310,2856648,984429) ORDER BY field (ArticleID,101050,100648,1091922,2793538,86751,2964226,3303702,1114916,100495,641802,368911,1114376,359340,1490605,924009,1114510,1096549,86926,628227,988279,100539,1449256,3108368,1114198,2079076,3067500,86831,1114310,2856648,984429)