本学期我们学习了角平分线的性质定理及其逆定理,那么,你是否还记得它们的具体内容.
(1)请把下面两个定理所缺的内容补充完整:
角平分线的性质定理:角平分线上的点到______的距离相等.
角平分线性质定理的逆定理:到角的两边距离相等的点在______.
(2)老师在黑板上画出了图形,把逆定理的已知、求证写在了黑板上,可是有些内容不完整,请你把内容补充完整.
![](https://img.xkw.com/dksih/QBM/2020/11/30/2604008437555200/2611764786487296/STEM/339d06f193a740e9a47d209df0236582.png?resizew=198)
(3)请你完成证明过程:
(4)知识运用:如图,三条公路两两相交,现在要修建一个加油站,使加油站到三条公路的距离相等,加油站可选择的位置共有______处.
(1)请把下面两个定理所缺的内容补充完整:
角平分线的性质定理:角平分线上的点到______的距离相等.
角平分线性质定理的逆定理:到角的两边距离相等的点在______.
(2)老师在黑板上画出了图形,把逆定理的已知、求证写在了黑板上,可是有些内容不完整,请你把内容补充完整.
![](https://img.xkw.com/dksih/QBM/2020/11/30/2604008437555200/2611764786487296/STEM/339d06f193a740e9a47d209df0236582.png?resizew=198)
已知:如右图,点![]() ![]() ![]() ![]() ![]() ![]() ![]() 求证:点 ![]() ![]() |
(4)知识运用:如图,三条公路两两相交,现在要修建一个加油站,使加油站到三条公路的距离相等,加油站可选择的位置共有______处.
![](https://img.xkw.com/dksih/QBM/2020/11/30/2604008437555200/2611764786487296/STEM/20674b49d8494a4c9f7af384ed43562f.png?resizew=231)
更新时间:2020-12-11 10:31:58
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【推荐1】将
沿
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刚好落在
边上的点
处.展开如图1.
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【操作观察】
(1)图1中,
.
①则
_________;
②若
,则
________;
【理解应用】
(2)如图2,若
,试说明∶
;
【拓展延伸】
(3)如图3,若
,点
为
的中点,且
.点
是
上的一个动点,连接
、
.
的最小值为________;
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【操作观察】
(1)图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39842668d4b65f34b3eafe408925ae5.png)
①则
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②若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ba21720fda641264518b638787454e.png)
【理解应用】
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9af7ab732d431dd78e84db9586d3cc.png)
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【拓展延伸】
(3)如图3,若
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【推荐2】如图,在四边形
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(1)求证:四边形
是平行四边形;
(2)若
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(2)若
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名校
【推荐1】如图,Rt∠ABC 中,∠ACB=90°, CD⊥AB于D.
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(1)尺规作图:在BC边上求作点Q,使得点Q到边AB的距离等于CQ(保留作图痕迹,不写做法);
(2)连接AQ(Q为所求作的点)交CD于点P,若∠ABC=55°,求∠CPQ的度数.
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(2)连接AQ(Q为所求作的点)交CD于点P,若∠ABC=55°,求∠CPQ的度数.
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【推荐2】小明在学习三角形知识时,发现如下三个有趣的结论:在Rt△ABC中,∠A=90°,BD平分∠ABC,M为直线AC上一点,ME⊥BC,垂足为E,∠AME的平分线交直线AB于点F.
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(1)M为边AC上一点,则BD、MF的位置是 .请你进行证明.
(2)M为边AC反向延长线上一点,则BD、MF的位置关系是 .请你进行证明.
(3)M为边AC延长线上一点,猜想BD、MF的位置关系是 .请你进行证明.
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229723716509696/2229868048416769/STEM/fa8543fba25a47c8bd1a69257b0e9383.png?resizew=424)
(1)M为边AC上一点,则BD、MF的位置是 .请你进行证明.
(2)M为边AC反向延长线上一点,则BD、MF的位置关系是 .请你进行证明.
(3)M为边AC延长线上一点,猜想BD、MF的位置关系是 .请你进行证明.
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