已知:∠AOB=60°.小亮在学习了角平分线的知识后,做了一个夹角为120°(即∠DPE=120°)的角尺,来作∠AOB的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8c4189c8-2714-4da5-960b-1663bc963f99.png?resizew=488)
(1)如图1,他先在边OA和OB上分别取OD=OE,再移动角尺使PD=PE,然后他就说射线OP是∠AOB的角平分线.试根据小亮的做法证明射线OP是∠AOB的角平分线;
(2)如图2,小亮在确认射线OP是∠AOB的角平分线后,想继续探究,于是将角尺绕点P旋转了一定的角度,他认为旋转后的线段PD和PE仍然相等.请问小亮的观点是否正确,为什么?
(3)如图3,在(2)的基础上,若角尺旋转后恰好使得DP
OB,请直接写出线段OD与OE的数量关系(不用说明理由).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/8c4189c8-2714-4da5-960b-1663bc963f99.png?resizew=488)
(1)如图1,他先在边OA和OB上分别取OD=OE,再移动角尺使PD=PE,然后他就说射线OP是∠AOB的角平分线.试根据小亮的做法证明射线OP是∠AOB的角平分线;
(2)如图2,小亮在确认射线OP是∠AOB的角平分线后,想继续探究,于是将角尺绕点P旋转了一定的角度,他认为旋转后的线段PD和PE仍然相等.请问小亮的观点是否正确,为什么?
(3)如图3,在(2)的基础上,若角尺旋转后恰好使得DP
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
更新时间:2022-10-09 15:43:27
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解答题-证明题
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【推荐1】在锐角△ABC中,∠B=45°,∠C=60°,AD⊥BC于点D.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897977820979200/2899001661513728/STEM/efee6813-be47-4f24-88c1-aa083ac92d75.png?resizew=651)
(1)如图1,过点B作BG⊥AC于点G,求证:AC=BF;
(2)动点P从点D出发,沿射线DB运动,连接AP,过点A作AQ⊥AP,且满足
.
①如图2,当点P在线线段BD上时,连接PQ分别交AD、AC于点M、N.请问是否存在某一时刻使得△APM和△AQN成轴对称,若有,求此刻∠APD的大小;若没有,请说明理由.
②如图3,连接BQ,交直线AD与点F,当点P在线段BD上时,试猜想BP和DF的数量关系并证明;当点P在DB的延长线上时,若
,请直接写出
的值.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897977820979200/2899001661513728/STEM/efee6813-be47-4f24-88c1-aa083ac92d75.png?resizew=651)
(1)如图1,过点B作BG⊥AC于点G,求证:AC=BF;
(2)动点P从点D出发,沿射线DB运动,连接AP,过点A作AQ⊥AP,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38bbd93669765af69d7bb0049e2819b.png)
①如图2,当点P在线线段BD上时,连接PQ分别交AD、AC于点M、N.请问是否存在某一时刻使得△APM和△AQN成轴对称,若有,求此刻∠APD的大小;若没有,请说明理由.
②如图3,连接BQ,交直线AD与点F,当点P在线段BD上时,试猜想BP和DF的数量关系并证明;当点P在DB的延长线上时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b5baab9773cb8e28e1921b0cfb130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2bc3e6d51c227ccfb537e7d62822e8.png)
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【推荐2】问题:如图1,在
中,
,
,D为BC边上一点(不与点B.C重合),将线段AD绕点A逆时针旋转
得到AE,连接EC.
(1)求证:
;
(2)探索:如图2,在
与
中,
,
,
,将
绕点A旋转,使点D落在BC边上,试探索线段
、
、
之间满足的数量关系,并证明你的结论;
(3)应用:如图3,在四边形ABCD中,
,若
,
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/ff849528-bcad-4991-800a-0750a449e4b3.png?resizew=510)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)探索:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d110261e49b946b3e859ad0a8ba48a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa12efe16e6c4ef0ec08a078ecbb5a2.png)
(3)应用:如图3,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2894a6ff5b198184fffcaa1d03a33227.png)
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解答题-作图题
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【推荐1】在
中,
,点E是
内一动点,连接
,将
绕点A顺时针旋转a,使
边与
重合,得到
,延长
与射线
交于点M(点M与点D不重合).
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710114436521984/2710166847406080/STEM/e1bfd97f-ef38-49fd-a7d5-675948112418.png?resizew=322)
(1)依题意补全图1;
(2)探究
与
的数量关系为___________;
(3)如图2,若
平分
,用等式表示线段
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cddfb301e16ecd8f2c790366bb7f46e.png)
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(1)依题意补全图1;
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080e6068fddddcfbe74687b4d015188d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b59874dae8b394a4e434aa3875708a.png)
(3)如图2,若
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【推荐2】如图,⊙O是Rt△ABC的外接圆,过点A作⊙O的切线交BC的延长线于点P,D是
上的任意一点,连接AD,已知∠ABC=30°.
(1)求证:AP=AB.
(2)填空:
①当∠CAD= 时,四边形AODC是菱形;
②当∠CAD= 时,四边形ABDC是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(1)求证:AP=AB.
(2)填空:
①当∠CAD= 时,四边形AODC是菱形;
②当∠CAD= 时,四边形ABDC是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/0096b8a3-5f73-4b12-8313-4f64c63e9bd5.png?resizew=229)
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