已知
为
的直径,
为
的弦,
交
于点D,过点C作
的切线交
的延长线于点E,交
的延长线于点F.(请自行作图)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cee097d4fe948c3d4f1b5c28b24adf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae2e9324d960a8854c3262e6677a4cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5239826fca7bee4cab3a5a486cecb7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ff13b4da65c7da3d898ba58e967b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
2024·陕西·模拟预测 查看更多[1]
更新时间:2024-05-06 10:16:26
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相似题推荐
解答题-证明题
|
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【推荐1】如图,
中,
,点
,
,
分别在三边上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/ddd8fb8f-0ca2-4d3b-af7b-23ba5f070063.png?resizew=141)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7322382eecd41e1348226680a830da9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/ddd8fb8f-0ca2-4d3b-af7b-23ba5f070063.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8d114d218cefd1b4e187c47607aea4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
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【推荐2】如图,
,
,
,过C作
,连接AF与BC相交于点G,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0bf528da59382284ce267513df9c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505025b766c774b179253a2c97c52529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34b2c6c1379ea4968962e96eba6cd18.png)
![](https://img.xkw.com/dksih/QBM/2022/7/11/3020408642838528/3021244697616384/STEM/c59db17f300f473d9b2b1e21d8b09bb3.png?resizew=327)
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【推荐3】先阅读下列材料,然后解答问题.
材料:从三角形(不是等腰三角形)一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原三角形相似,我们把这条线段叫做这个三角形的完美分割线例如:如图①,AD把△ABC分成△ABD与△ADC,若△ABD是等腰三角形,且△ADC∽△BAC,那么AD就是△ABC的完美分割线.
解答下列问题:
(1)如图②,在△ABC中,∠B=40°,AD是△ABC的完美分割线,且△ABD是以AD为底边的等腰三角形,则∠CAD= 度.
(2)在△ABC中,∠B=42°,AD是△ABC的完美分割线,且△ABD是等腰三角形,求∠BAC的度数.
材料:从三角形(不是等腰三角形)一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原三角形相似,我们把这条线段叫做这个三角形的完美分割线例如:如图①,AD把△ABC分成△ABD与△ADC,若△ABD是等腰三角形,且△ADC∽△BAC,那么AD就是△ABC的完美分割线.
解答下列问题:
(1)如图②,在△ABC中,∠B=40°,AD是△ABC的完美分割线,且△ABD是以AD为底边的等腰三角形,则∠CAD= 度.
(2)在△ABC中,∠B=42°,AD是△ABC的完美分割线,且△ABD是等腰三角形,求∠BAC的度数.
![](https://img.xkw.com/dksih/QBM/2019/5/28/2213267193593856/2213596684378112/STEM/293aadc613524e2087b16fb6e658f2fe.png?resizew=414)
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【推荐1】综合探究
如图,在长方形
中,
,
,在边
上取一点E,将
折叠后点D恰好落在
边上的点F,点P是线段
上的一个动点.
(1)求
的长;
(2)当
是直角三角形时,求
的长;
(3)连接
,设
,
,求y关于x的函数解析式.
如图,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/b7515007-de6a-439c-badf-18ae2134f475.png?resizew=280)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceff3844281849df3e37a2e56e110549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9430ed2758fa65bf69511aaff14d9b2c.png)
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【推荐2】如图,已知
,延长
到E,使
,连接
,
,
,若
.
是矩形;
(2)连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abcd9292846e104dc2234b0aea41a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe2a58326612fcabd34fd4402a66ee.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解题方法
【推荐1】如图,在
中,
,
,
,延长
到点
,使
,
是
边上一点,点
在射线
上,
,以点
为圆心,
长为半径作
,交
于点
,连接
,设
.
________,
________,当点
在
上时,求
的值;
(2)
为何值时,
与
相切?
(3)当
时,求阴影部分的面积;
(4)若
与
的三边有两个公共点,直接写出
的取值范围.
![](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/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab0389bef7fea9fd2429966ef6bf2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f434f74b3dacd3dcefdaed7e98e366c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9334d4bc38bab6fb1bd59e44aacc4964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbdc5a132d35551a980fcef4e7ea5b2f.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图,在
中,
,
,点O为边
中点,以点O为圆心的圆与
相切于点D.
是
的切线;
(2)判断圆心O与点C及两切点为顶点的四边形的形状并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)判断圆心O与点C及两切点为顶点的四边形的形状并证明.
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【推荐1】如图①,先把一矩形
纸片上下对折,设折痕为
;如图②,再把点
叠在折痕线
上,得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b73071db1b5fa051c88f7093fed12a4.png)
,过
点作
,分别交
、
于点
、
;
(1)求证:
∽
;
(2)在图②中,如果沿直线
再次折叠纸片,点
能否叠在直线
上?请说明理由;
(3)在(2)的条件下,若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b73071db1b5fa051c88f7093fed12a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7555f635da615b09b7e2f08ddbeaf1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.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/acc290b44635265137fdf13146b6a6d9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1742b04f56cd6b3c956b4607ebb880f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1ddff9c93c234562c44d1808831bc5.png)
(2)在图②中,如果沿直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/d3646fc3-139f-4285-905b-9aa9ff39d310.png?resizew=326)
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【推荐2】【定义】
对角线相等且所夹锐角为
的四边形叫“
等角线四边形”.
如图1,四边形
为“
等角线四边形”,即
,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/22722d0d-dabb-4516-8f51-1684fad05386.png?resizew=372)
【定义探究】
(1)判断下列四边形是否为“
等角线四边形”,如果是在括号内打“√”,如果不是打“×”.
①对角线所夹锐角为
的平行四边形. ( )
②对角线所夹锐角为
的矩形. ( )
③对角线所夹锐角为
,且顺次连接各边中点所形成的四边形是菱形的四边形. ( )
【性质探究】
(2)如图2,以
为边,向下构造等边
,连接
,请直接写出
与
的大小关系;
(3)请判断
与
的大小关系,并说明理由;
【应用提升】
(4)若“
等角线四边形”的对角线长为2,则该四边形周长的最小值为________.
对角线相等且所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/22722d0d-dabb-4516-8f51-1684fad05386.png?resizew=372)
【定义探究】
(1)判断下列四边形是否为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
①对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
②对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
③对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
【性质探究】
(2)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aac055263010139f6eb4df68f9d619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57041caba590305ccb37a3a7fbd2a14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8c5076f7a4391faa5f3ae8c8efd477.png)
【应用提升】
(4)若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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