已知△ABC和△ADE都是等腰直角三角形,∠ACB=∠ADE=90°,点F为BE中点,连结DF,CF.
(1)如图1,点D在AC上,请你判断此时线段DF,CF的关系,并证明你的判断;
(2)如图2,在(1)的条件下将△ADE绕点A顺时针旋转45度时,若AD=DE=2,AB=6,求此时线段CF的长.
(1)如图1,点D在AC上,请你判断此时线段DF,CF的关系,并证明你的判断;
(2)如图2,在(1)的条件下将△ADE绕点A顺时针旋转45度时,若AD=DE=2,AB=6,求此时线段CF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/ba438d7d-8ad6-4eff-97aa-0cdf0b141915.png?resizew=282)
更新时间:2020-01-02 09:35:23
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【推荐2】如图,在△ABC中,AD平分∠BAC.
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(1)若AC=BC,∠B:∠C=2:1,写出图中的所有等腰三角形,并给予证明;
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【推荐1】已知,如图,∠MAN=90°,点B是∠MAN的内一点,且到AM,AN的距离相等.过点B作射线BC交AM于点C,将射线BC绕点B逆时针旋转90°交AN于点D.
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解题方法
【推荐2】(1)问题发现:
如图1,
和
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,连接
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、
在同一条直线上,则
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之间的数量关系__________;
(2)拓展探究:
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和
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,
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、
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、
之间的数量关系和位置关系,并说明理由.
(3)解决问题:
如图3,
和
均为等腰三角形,
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和
的夹角为__________.(请用含
的式子表示)
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【推荐1】在△ABC中,AB=AC,P是BC上任意一点.
(1)如图①,若P是BC边上任意一点,PF⊥AB于点F,PE⊥AC于点E,BD为△ABC的高线,试探求PE,PF与BD之间的数量关系;
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(2)如图②,若P是BC延长线上一点,PF⊥AB于点F,PE⊥AC于点E,CD为△ABC的高线,试探求PE,PF与CD之间的数量关系.
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(2)如图②,若P是BC延长线上一点,PF⊥AB于点F,PE⊥AC于点E,CD为△ABC的高线,试探求PE,PF与CD之间的数量关系.
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【推荐2】已知:在中,
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(3)拓展延伸
如图3,,请求出线段
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