已知,如图,正方形ABCD,BM,DN分别平分正方形的两个外角,且满足∠MAN=45°,连接MN.
![](https://img.xkw.com/dksih/QBM/2015/7/10/1573868427329536/1573868433883136/STEM/39feb1b703524e4a98b0fd409026d197.png?resizew=145)
(1)若正方形的边长为a,求BM·DN的值;
(2)若以BM,DN,MN为三边围成三角形,试猜想三角形的形状,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2015/7/10/1573868427329536/1573868433883136/STEM/39feb1b703524e4a98b0fd409026d197.png?resizew=145)
(1)若正方形的边长为a,求BM·DN的值;
(2)若以BM,DN,MN为三边围成三角形,试猜想三角形的形状,并证明你的结论.
14-15九年级·全国·课后作业 查看更多[3]
2015年人教版初中数学九年级27.2.2练习卷1(已下线)第22章 四边形(单元提升卷)-2021-2022学年八年级数学下学期考试满分全攻略(沪教版)2022年陕西省咸阳市秦都区启迪中学中考数学第一次适应性试卷
更新时间:2016-12-06 01:06:26
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适中
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【推荐1】如图,在
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【推荐2】如图,
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【推荐1】学习感知:
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解答题-作图题
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适中
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解答题-证明题
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适中
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【推荐1】在正方形ABCD中,
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解答题-证明题
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名校
【推荐2】如图,在△ABC中,∠C=90°,点O在AC上,以OA为半径的⊙O交AB于点D,BD的垂直平分线交BC于点E,交BD于点F,连接DE.
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