如图,P是正方形ABCD对角线BD上一点,PE⊥DC,PF⊥BC,E、F分别为垂足.
(1)求证:△APD≌△CPD;
(2)若CF=3,CE=4,求AP的长.
(1)求证:△APD≌△CPD;
(2)若CF=3,CE=4,求AP的长.
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854418571313152/1855161827188736/STEM/258debf4a539446d8d11ebd67030a6e0.png?resizew=122)
2018九年级上·全国·专题练习 查看更多[2]
更新时间:2017-12-05 06:12:59
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解答题-证明题
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【推荐1】在
中,
,点
在
边上,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/323dff53-a6d1-40ee-8b89-241ac079862e.png?resizew=590)
(1)如图1,求证:
为等边三角形;
(2)如图2,点
在
边上,连接
交
于
,若
,求
的度数;
(3)如图3,在(2)的条件下,点
是
中点,点
在
延长线上,连接
,且
,过点
作
于点
,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fb52b79670703261604794f188d896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/323dff53-a6d1-40ee-8b89-241ac079862e.png?resizew=590)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7724af2445c723d1392aed54d210ed3a.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0c7b501ceda20dba906e5a90329edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6f584802de2e7335d5b6ba33c9ac50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9634543e92e327f52eea92aa2fee7d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96588a6ba659e4514d95ea9b12bb104b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图,已知线段
,点
为平面内一动点,连接
,
,若
,
,以
为边作等边
(点
,
在
同则),连接
.
(1)若
,
,求证:
.
(2)当
时,判断
的形状,并说明理由.
(3)当点
在平面上运动时,探究:
满足什么条件使得
恒成立.并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/b8f1abccdfc42569b185e26c9df36cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a4a3077ceb252c79ce4b4fad87ce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/1/7ff4d461-8b23-4884-8208-fe1a7d313477.jpg?resizew=246)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af8c6b42f0de2a20b5a6c63223d6eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af8c6b42f0de2a20b5a6c63223d6eea.png)
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【推荐1】如图,在平面直角坐标系中,正比例函数
的图象经过点
,点A在线段
上,点B在x轴的正半轴上,且
,点B关于点
的对称点为点C,连接
,设点A的横坐标为t.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/224bc74a-c81d-41ea-9a1b-04ba32378634.png?resizew=172)
(1)求k的值,并写出当
时x的取值范围.
(2)当点A在线段
上运动时,设
的长为S.
①求S关于t的函数表达式.
②当
时,求
的长.
(3)当
为直角三角形时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa841ce5d58b64f747a3c1b69bb20a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872b4e9a575c0ae0a350880417d5a0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231925a73550e5d4a928bae284485bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b38a3469778fc6557e38bc22fa46979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/224bc74a-c81d-41ea-9a1b-04ba32378634.png?resizew=172)
(1)求k的值,并写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92fc2a10fa441a41b8210d6e5da3299.png)
(2)当点A在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
①求S关于t的函数表达式.
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9d51a70b2525488342058cd94bea75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,
中,
,过A点作
的平行线与
的平分线交于点
,连接
.
(1)求证:四边形
是菱形;
(2)过点
作
的平行线交直线
于点
,连接
,
,点
是线段
上的动点,若
,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/62012b6f-2c69-4cbd-85df-dadc07cb8869.png?resizew=179)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb86315b85d0ead7b542f08eb1359cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4688c035ef5b8b5cec798a378b2c6b.png)
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【推荐1】(1)如图1,在正方形
中,E为
边上一动点(点E,B不重合),
是等腰直角三角形,
,连接
,求出
的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/71fffd41-8fb9-4041-be37-caa8408e43ab.png?resizew=193)
(2)如图2,正方形
的边长为2,
,在
下方以
为斜边作等腰直角
,求
的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/1eed21e1-1fed-4eab-b6d8-8a6556972100.png?resizew=178)
(3)如图3,在正方形
中,E为
边上一动点(点E,B不重合),
是等腰直角三角形,
,连接
,知道正方形的边长时,可以求出
周长的最小值.当
时,请你求出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b78356dbceb326e1b1561e0a15d8ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf7cc67acfa50ef6b21d9aa379e604a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/71fffd41-8fb9-4041-be37-caa8408e43ab.png?resizew=193)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5564681937f41e1489d69b20a71f9222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/1eed21e1-1fed-4eab-b6d8-8a6556972100.png?resizew=178)
(3)如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b78356dbceb326e1b1561e0a15d8ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/53940653-696f-4708-aeea-1540538ba1f4.png?resizew=200)
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【推荐2】如图,已知四边形
和四边形
.连接
,
,直线
交
于M.
![](https://img.xkw.com/dksih/QBM/2023/5/25/3245524870275072/3246608934830080/STEM/0c4fce631f304aaabb1e0a49aff310f4.png?resizew=454)
(1)如图1,若四边形
和四边形
均为正方形.求证:
;
(2)如图2,若(1)中的两个正方形均为矩形,且满足
,且将四边形
绕点C旋转到如图所示的位置.
①在图(2)中,(1)中的结论是仍然成立?若成立,请证明,若不成立,请说明理由.
②若
,
,
,
______.(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8586ae37f043ee8d5162dec22126b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/2023/5/25/3245524870275072/3246608934830080/STEM/0c4fce631f304aaabb1e0a49aff310f4.png?resizew=454)
(1)如图1,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8586ae37f043ee8d5162dec22126b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347f7926c3d24d66b6b1adf0b614ffeb.png)
(2)如图2,若(1)中的两个正方形均为矩形,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292f73d39ca889f3cb626ed7becdb0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8586ae37f043ee8d5162dec22126b.png)
①在图(2)中,(1)中的结论是仍然成立?若成立,请证明,若不成立,请说明理由.
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2f91aa5dea19712561c7905535d15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7913622886743eb2c0e0021ef04c779.png)
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【推荐3】某数学兴趣小组利用正方形硬纸片开展了一次活动,请阅读下面的探究片段,完成所提出的问题.
四边形
是边长为4的正方形,点E是射线
上的动点,
,且
交正方形外角的角平分线
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/e48a9ae2-ef85-4012-8c15-d384e579771e.png?resizew=538)
【探究1】当点E是
中点时,如图1,发现
,这需要证明
与
所在的两个三角形全等,而
与
显然不全等,考虑到点E是
的中点,取
的中点H,连接
,证明
与
全等即可.
【探究2】
(1)如图2,如果把“点E是边
的中点”改为“点E是边
上(不与点B、C重合)的任意一点”,其他条件不变,那么结论“
”仍然成立吗?如果成立,写出证明过程,如果不成立,请说明理由;
(2)如图3,如果点E是边
延长线上的任意一点,其他条件不变,请你画出图形,并判断“
”是否成立? (填“是”或“否”);
【探究3】
(3)连接
交直线
于点I,连接
,试探究线段
之间的数量关系,并说明理由.
【探究4】
(4)当
时,此时
的面积为 .
四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/e48a9ae2-ef85-4012-8c15-d384e579771e.png?resizew=538)
【探究1】当点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c384685fc5cc1bb112dc6a50ab394f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d43af5a1c59dfeb9819827b19f72db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
【探究2】
(1)如图2,如果把“点E是边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(2)如图3,如果点E是边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
【探究3】
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc14b9e264c42e07e5dbb4503d2dcc79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11079f2b1d93c37d13bd5d032b4827f7.png)
【探究4】
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038047c65975014d1cbf5e3d3c6f87f4.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图1,
中,
,直线
点
是
上的动点,过
三点的圆交直线
于点
,连结
.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/9cc1a4dafebd4ae4ad045b93256cbc8f.png?resizew=204)
当点
与点
重合时如图2所示,连
,求证:四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/11ff3bb9680a46bfb126338e93323331.png?resizew=192)
如图3,当
与过
三点的圆相切时,求
的长.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/e86c675fca954f35aaa54c87a09af4c8.png?resizew=203)
作点
关于直线
的对称点
,试判断
能否落在直线
上,若能请直接写出
的长,若不能说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11de92ecd6ebb483c74dee0f6335e34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9899680baf785e2f705d4cd4f589340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a922719e276f2cecbc2967ff54f182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/9cc1a4dafebd4ae4ad045b93256cbc8f.png?resizew=204)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df19df3b0eb0eedd2b9eaa440996fd8.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/11ff3bb9680a46bfb126338e93323331.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a922719e276f2cecbc2967ff54f182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2486883556614144/2492414472257536/STEM/e86c675fca954f35aaa54c87a09af4c8.png?resizew=203)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
解题方法
【推荐2】观察思考:如图,A、
是直线
上的两个定点,点
、
在直线
上运动(点
在点
的左侧),
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
、
间的距离为
,连接
、
、
,把
沿
折叠得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/808c9244-d147-4d98-ad7d-4597a50d0e56.png?resizew=183)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/ae0c571c-51a9-48dc-b395-6b372618eade.png?resizew=474)
(1) 当
、
两点重合时,则
__________
;
(2)当
、
两点不重合时,
①连接
,探究
与
的位置关系,并说明理由;
②若以
、
、
、
为顶点的四边形是矩形,画出示意图并直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1dffae930288b05f8dd99d7309647c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074f404bfbb4cb5ed44c4800e60ef6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1080295895df074480087279a84d7a2a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/808c9244-d147-4d98-ad7d-4597a50d0e56.png?resizew=183)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/ae0c571c-51a9-48dc-b395-6b372618eade.png?resizew=474)
(1) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次