已知
中,
,
,过顶点
作射线
.
(1)当射线
在
外部时,如图①,点
在射线
上,连结
、
,已知
,
,
(
).
①试证明
是直角三角形;
②求线段
的长.(用含
的代数式表示)
(2)当射线
在
内部时,如图②,过点
作
于点
,连结
,请写出线段
、
、
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(1)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e406e302ae97cdd8e6233c623110259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/052f21e60a32c9095bd70f1c1462a700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ebce1029514cd3aa86e89607fe1db3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/0c196c24-2035-44e3-9b05-0be69cc1a71a.png?resizew=157)
①试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
②求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e1de129bfc451f4c7160cc50666ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/d37ccf3a-5356-4a2f-8a70-052be0df6e1e.png?resizew=218)
更新时间:2020-02-05 17:55:15
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,在△ABC中,∠BAC=90°,AB=AC.MN是过点A的直线,BD⊥MN 于D,CE⊥MN于E.
(1)求证:BD=AE.
(2)若将MN绕点A旋转,使MN与BC相交于点G(如图2),其他条件不变,求证:BD=AE.
(3)在(2)的情况下,若CE的延长线过AB的中点F(如图3),连接GF,求证:∠AFE=∠BFG.
(1)求证:BD=AE.
(2)若将MN绕点A旋转,使MN与BC相交于点G(如图2),其他条件不变,求证:BD=AE.
(3)在(2)的情况下,若CE的延长线过AB的中点F(如图3),连接GF,求证:∠AFE=∠BFG.
![](https://img.xkw.com/dksih/QBM/2019/8/29/2279103794585600/2296108115918848/STEM/839896807f5d47c38295ef7ca7cad556.png?resizew=554)
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【推荐2】如图,
与
中,
,
,
,
,
,连接
、
.
(1)如图1,若
,
,求
的度数;
(2)如图2,若
,
平分
,求证:
;
(3)如图3,
与
的延长线交于点
,若
,延长
与
交于点
,在
上有一点
,且
,连接
,请猜想
、
、
之间的数量关系并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a8ee575ca2160f8c7c8ea9c1156de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb50217f0641620534b8b13b01d4c70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/1f491300-46c2-4b5f-96f4-a1840caeaf79.png?resizew=444)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7c2d7e9d0c54e42cec251084fc1d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297de52ed52180b6aeadcaf9b738a066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126fdae0b1adc7361f945187b861fb20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70bd9987ec739ba5fd33333ca29ac2ef.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0a91e42f10d4bad0b6829ced85746e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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解答题-证明题
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【推荐1】已知,在Rt△ABC中,∠ACB=90°,AC=4,BC=2,D是AC边上的一个动点,将△ABD沿BD所在直线折叠,使点A落在点P处.
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876482088108032/1883627667824640/STEM/2ee9fc7f5d3447448d54e997ee6d306a.png?resizew=405)
(1)如图1,若点D是AC中点,连接PC.
①写出BP,BD的长;
②求证:四边形BCPD是平行四边形.
(2)如图2,若BD=AD,过点P作PH⊥BC交BC的延长线于点H,求PH的长.
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876482088108032/1883627667824640/STEM/2ee9fc7f5d3447448d54e997ee6d306a.png?resizew=405)
(1)如图1,若点D是AC中点,连接PC.
①写出BP,BD的长;
②求证:四边形BCPD是平行四边形.
(2)如图2,若BD=AD,过点P作PH⊥BC交BC的延长线于点H,求PH的长.
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解答题-证明题
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(0.4)
名校
解题方法
【推荐2】阅读与理解:
折纸,常常能为证明一个命题提供思路和方法.例如,在
中,
(如图),怎样证明
呢?
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422068767555584/2422149250064384/STEM/dd318c46f90c4c36b9dbf17fb7c630fb.png?resizew=387)
分析:把
沿
的角平分线
翻折,因为
,所以,点
落在
上的点
处,即
,据以上操作,易证明
,所以
,又因为
,所以
.
感悟与应用:
(1)如图(a),在
中,
,
,
平分
,试判断
和
、
之间的数量关系,并说明理由;
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422068767555584/2422149250064384/STEM/cd2c523aee0941eba78bbfa3b6d1dc4c.png?resizew=375)
(2)如图(b),在四边形
中,
平分
,
,
,
,
①求证:
;
②求
的长.
折纸,常常能为证明一个命题提供思路和方法.例如,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422068767555584/2422149250064384/STEM/dd318c46f90c4c36b9dbf17fb7c630fb.png?resizew=387)
分析:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af33685c34d269c03e0f24393ea4c203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1d5784434a2a2e63ffcb0864089d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590c279daace2aa6f040433b1baf226f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ebcaf0a0d043d94769fb90e49668bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6f337c00a6d4bf1e7580d8888db3d6.png)
感悟与应用:
(1)如图(a),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/3/18/2422068767555584/2422149250064384/STEM/cd2c523aee0941eba78bbfa3b6d1dc4c.png?resizew=375)
(2)如图(b),在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68cf1d63078e60370e3fea15b9dbf9c6.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-问答题
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【推荐1】在综合实践课上,老师设计下面问题,请你解答.
如图1,在平面直角坐标系中,过点
作
轴的对称点
,再分别作点
关于直线
和
轴的对称点
,则点
可以看作是点
绕点
顺时针旋转得到的,旋转角的度数为___________;点
可以看作是点
关于点___________的对称点.
(2)探究迁移
如图2,正方形
中,
为直线
下方一点,作点
关于直线
的对称点
,再分别作
关于直线
和直线
的对称点
和
,连接
,
,请仅就图2的情况解决以下问题:
①请判断
的度数,并说明理由;
②若
,求
两点间的距离.
(3)拓展应用
在(2)的条件下,若
,请直接写出
的长.
如图1,在平面直角坐标系中,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eccfc5c7359cc51c9793c52a4dc4935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b19cad0a7a57c284cf5412ed834aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)探究迁移
如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797e67927616b141ed7c6b83f8b6f4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a966dd540586db85022fc116da49a2e8.png)
①请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff860b3ca85a45ad6e2b3f8c5c25bdb.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7314a3d56862aaff48a44e455cded5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be56ba2c0be4776fa76fde419d707d0.png)
(3)拓展应用
在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6d04a6c5272dbcfc85fb0e43ddb1e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
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【推荐2】如图,在⊙O中,△ABD内接于⊙O,BD=3cm,AD=4cm,AB=5cm.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942449774149632/2964228512178176/STEM/ed069611-2488-4ebf-b53e-702c6522e8f5.png?resizew=187)
(1)求证:AB是⊙O的直径;
(2)点C是AB延长线上的一点,且CD2=BC·AC,试判断CD与⊙O的位置关系,并说明理由;
(3)在(2)的条件下,若点E是AC上一点,且∠DEC=45°,则
=_______.请先从以下选项中选择正确答案的序号,再证明.
①AE·BF ②AD·BF ③CD·BF
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942449774149632/2964228512178176/STEM/ed069611-2488-4ebf-b53e-702c6522e8f5.png?resizew=187)
(1)求证:AB是⊙O的直径;
(2)点C是AB延长线上的一点,且CD2=BC·AC,试判断CD与⊙O的位置关系,并说明理由;
(3)在(2)的条件下,若点E是AC上一点,且∠DEC=45°,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7a6901af6bf907d2baf1b42a0a704d.png)
①AE·BF ②AD·BF ③CD·BF
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