如图,
中,
,
于
,
平分
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2740139162116096/2740177169170432/STEM/304227e21c814a1abd5ddc92024e5af8.png?resizew=243)
2021八年级下·广东·专题练习 查看更多[2]
(已下线)专项复习01 第一章 三角形的证明-2020-2021学年八年级数学下学期期末专项复习(北师大版,广东专用)云南省昭通市巧家县大寨中学2022-2023学年九年级下学期4月月考数学试题
更新时间:2021-06-10 20:47:38
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【推荐1】
中,若过顶点B的一条直线把这个三角形分割成两个三角形,其中一个为等腰三角形,另一个为直角三角形,则称这条直线为
的关于点B的二分割线.例如:如图1,
中,
,
,若过顶点B的一条直线
交
于点D,且
,则直线
是
的关于点B的二分割线.如图2,
中,
,钝角
同时满足:①
为最小角;②存在关于点B的二分割线,则
的度数为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a896e05730e8dd3bee64a4911c33dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75e6dae9fd78e52ee1e3c875367c4ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8dfdafc766afe7e5ae949ae8d6261d.png)
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【推荐1】如图,在第1个
中,
;在边
上任取一点
.延长
到
,使
,得到第2个
;在边
上任取一点
,延长
到
,使
,得到第3个
按此法继续下去,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b35e75ab231af675ff021a33383cc8.png)
________________ 第
个以
为顶点的三角形的底角度数是________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e827641feb4179bca7033ed8760bf728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5c908b1d6f6e9518886262a1bbb38e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31600b262ae1241cd73738c34bbb9789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee3e259eccb7e77b3f4f2fe60fda24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32f1d6db99180ae7ee8af66f423dded.png)
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【推荐2】如图,
、
相交于点E,
,
,F、G、H分别为
、
、
的中点,
.则
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c231c1150e27c34eb787a46b02ea8.png)
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【推荐1】在△ABC中,∠BAC的角平分线AN⊥BN,M是BC的中点,已知AB=4,AC=6,则MN=________ .
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【推荐2】如图,四边形
中,
,
,
,
,则
的长为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e7f748d88b4eadfd1643c6b31fdf08.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f575ff63d7e510f8aa7469fbfdc5fd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/9618bb7a-3038-481d-8c6d-23438af8bad4.png?resizew=182)
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【推荐1】如图,已知矩形ABCD的边AB=4,BC=3,CF⊥EF,AE⊥EF,垂足分别为F,E,若CF=3,EF=1,则AE的长为______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/d129b995-4003-47f1-8a96-60e9830a47b2.png?resizew=190)
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【推荐2】如图,在
中,
,点D是边AB的中点,过点D作
于点M,延长DM至点E,且
,连接AE交BC于点N,若
,则点N到BE的距离为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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