如图,在正方形
中,点
是边
上的点,点
在边
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/0ca674ec-c54e-46fb-8a58-aea1e1aca053.png?resizew=262)
(1)求证:
;
(2)若
,延长
交
的延长线于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee98a0cb286c6323b0285e021024d4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d44584fd148c9b28da7b311798bfba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/0ca674ec-c54e-46fb-8a58-aea1e1aca053.png?resizew=262)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f84d22bff850ead07a39d681aee77f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
更新时间:2022-07-12 20:12:30
|
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,按如下步骤作图:
①以点A为圆心,AB长为半径画弧;
②以点C为圆心,CB长为半径画弧,两弧相交于点D;
③连接BD,与AC交于点E,连接AD、CD;
(1)求证:
;
(2)当
时,猜想四边形ABCD是什么四边形,并证明你的结论;
(3)当
,
,现将四边形ABCD通过割补,拼成一个正方形,那么这个正方形的边长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
①以点A为圆心,AB长为半径画弧;
②以点C为圆心,CB长为半径画弧,两弧相交于点D;
③连接BD,与AC交于点E,连接AD、CD;
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc8c4f6e8d4d21439ee0f7f3a64e77c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f71a52438196c3aca604fa927be8e5.png)
![](https://img.xkw.com/dksih/QBM/2019/7/26/2255311068954624/2255433424969728/STEM/4b66c2d928e24f37b0f547dd6072a283.png?resizew=169)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】正方形
中,点E为
边上的任意一点(点E不与B,C重合),点P为线段
上一动点,过点P作直线
.
(1)如图1,当直线l经过点D时,直线l交
边于点F,求证:
;
(2)如图2,当直线l分别交
边,
边于点M,点N时,如果
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c5c1789cab66ecf8d5b17216d43c96.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/d6b53d50-7861-4451-abd1-c102ac1144a0.png?resizew=307)
(1)如图1,当直线l经过点D时,直线l交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c4491b334748bceb87485a33b38638.png)
(2)如图2,当直线l分别交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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您最近一年使用:0次
解答题-作图题
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适中
(0.65)
【推荐1】如图①,有两个△ABC和△A′B′C′,其中∠C+∠C′=180°,且两个三角形不相似.能否分别用一条直线分割这两个三角形,使△ABC所分割成的两个三角形与△A′B′C′所分割成的两个三角形分别相似?如果能,画出分割线,并标明相等的角;如果不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124524991332352/2125154426650624/STEM/7be53cbc194142a0b62d480d8fcd9314.png?resizew=532)
小明经过思考后,尝试从特殊情况入手,画出了当∠C=∠C′=90°时的分割线:
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124524991332352/2125154426650624/STEM/fe96e5e3f312483e8c0d8e67631a98db.png?resizew=543)
(1)小明在完成画图后给出了如下证明思路,请补全他的证明思路.
由画图可得△BCD∽△ .
由∠A+∠B=90°,∠A′C′D′+∠B′C′D′=90°,∠A′C′D′=∠B,得 .
同理可得:∠B′=∠ACD.
由此得:△ACD∽△ .
(2)当∠C>∠C′时,请在图①的两个三角形中分别画出满足题意的分割线,并标明相等的角.(不写画法)
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124524991332352/2125154426650624/STEM/7be53cbc194142a0b62d480d8fcd9314.png?resizew=532)
小明经过思考后,尝试从特殊情况入手,画出了当∠C=∠C′=90°时的分割线:
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124524991332352/2125154426650624/STEM/fe96e5e3f312483e8c0d8e67631a98db.png?resizew=543)
(1)小明在完成画图后给出了如下证明思路,请补全他的证明思路.
由画图可得△BCD∽△ .
由∠A+∠B=90°,∠A′C′D′+∠B′C′D′=90°,∠A′C′D′=∠B,得 .
同理可得:∠B′=∠ACD.
由此得:△ACD∽△ .
(2)当∠C>∠C′时,请在图①的两个三角形中分别画出满足题意的分割线,并标明相等的角.(不写画法)
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解答题-问答题
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您最近一年使用:0次