如何计算圆柱底面周长

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select * from tbl_Articles WHERE ArticleID=2266673 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2266673 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2266673 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(785572,1655230,1907440,658847,2386155,426986,1127381,1865331,1840584,1075967,1776399,2755059,1079606,1498520,1498842,2232811,2673893,413987,1414408,1102608,2545451,1132577,2019352,1127027,1660695,640167,2263374,898521,317519,2454549) ORDER BY field (ArticleID,785572,1655230,1907440,658847,2386155,426986,1127381,1865331,1840584,1075967,1776399,2755059,1079606,1498520,1498842,2232811,2673893,413987,1414408,1102608,2545451,1132577,2019352,1127027,1660695,640167,2263374,898521,317519,2454549)