若空间四边形
的两条对角线
的长分别是8,12,则过
的中点
且平行于
的截面四边形的周长为________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c06c3dd8b12d1cdfd5fb66b0d6568d9.png)
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10-11高二下·福建泉州·期末 查看更多[4]
(已下线)2010-2011学年福建省南安一中高二下学期期末考试数学(文)(已下线)2011-2012学年安徽省太湖中学高一第二学期期中考试数学试卷人教A版 全能练习 必修2 第二章 第二节 2.2.3 直线与平面平行的性质人教A版高中数学必修二2.2.2平面与平面平行的判定2
更新时间:2016-12-01 19:06:44
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