如图①,A是⊙O外一点,AB与⊙O相切于点B,AO的延长线交⊙O于点C,过点B作BD//AC,交⊙O于点D,连接DO,并延长DO交⊙O于点E,连接AE.已知BD=2,⊙O的半径为3.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760325806653440/2768311063601152/STEM/92d57a7806524a4ba003c3d8d65a6a48.png?resizew=321)
(1)求证:AE是⊙O的切线;
(2)求AE的长;
(3)如图②,若点M是⊙O上一点,且BM=3,过A作AN//BM,交弧ME于点N,连接ME,交AN于点G,连接OG,则OG的长度是 .
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760325806653440/2768311063601152/STEM/92d57a7806524a4ba003c3d8d65a6a48.png?resizew=321)
(1)求证:AE是⊙O的切线;
(2)求AE的长;
(3)如图②,若点M是⊙O上一点,且BM=3,过A作AN//BM,交弧ME于点N,连接ME,交AN于点G,连接OG,则OG的长度是 .
更新时间:2021-07-20 14:46:11
|
相似题推荐
解答题-证明题
|
困难
(0.15)
【推荐1】如图,已知中,
,
,点D是
所在平面内一点,连接
,
,
.
(1)如图1,点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6169cacf6c961ec78ccbd60db2726778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8088445817cd372f19b3cfdf5c73523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)如图2,点D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图3,点C关于直线
![](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/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c430808cb91d66ce60b1e2f83f129db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900b844294e8c07ea9a858adb845121c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900b844294e8c07ea9a858adb845121c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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解答题-证明题
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困难
(0.15)
【推荐2】在
中,直径
与弦
(非直径)交于点
,弦
交
于点G,交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/31f3eeaf-7e0a-43cd-887d-c0c51856de17.png?resizew=480)
(1)如图1,求证:
;
(2)如图2,点N为弧
上一点,连接
,并延长
交
于点M,H为
上一点,连接
,求证:
;
(3)如图3,在(2)的条件下,点P为
延长线上一点,连接
交
于点Q,延长
交
于点R,
,连接
交
于点K,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/385e933c273ba2c36a3ff47a06cf2d55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651eefa4817cceaaa15597cdc38c8760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/31f3eeaf-7e0a-43cd-887d-c0c51856de17.png?resizew=480)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a01ba0441e2bac7e967c48bfed28ee8.png)
(2)如图2,点N为弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf5cbd8e91ee2b38ff4948963b6ac8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1043e9b0fa6748bbac3f0ff0b24d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2667fc9a2affbfad80ed5bd4210aea.png)
(3)如图3,在(2)的条件下,点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143c4dd631630b962cc468282cf2e9c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d74c3239c90f666b66e7f506c570fa70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d212060a105fe73cc44ad5a232b564.png)
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解答题-问答题
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困难
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【推荐3】(1)【问题提出】如图1,在矩形
中,
,
,点E为
的中点,点P为矩形
内以
为直径的半圆上一点,则
的最小值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/0da6e80c-d218-4f72-87f5-ae2a6a620cdd.png?resizew=392)
(2)【问题探究】如图2,在
中,
为
边上高,且
,点P为
内一点,当
时,求
的最小值;
(3)【问题解决】李伯伯家有一块直角三角形菜园
,如图3,
米,
,
,李伯伯准备在该三角形菜园内取一点P,使得
,并在
内种植当季蔬菜,边
的中点D为菜园出入口,为了种植方便,李伯伯打算在
边上取点E,并沿
、
修两条人行走道,为了节省时间,要求人行走道的总长度
尽可能小,问
的长度是否存在最小值?若存在,求出其最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/0da6e80c-d218-4f72-87f5-ae2a6a620cdd.png?resizew=392)
(2)【问题探究】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf91a833f6977fbefc242f8a8bbeef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b6fbbc0fec28597714914a14a4d528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d1d99eab930cef884e01b97d4d56f1.png)
(3)【问题解决】李伯伯家有一块直角三角形菜园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fa54e1b89b882c7421dae6034fd27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b3bfde4b7cbca10de7d63bb7b2cfd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30f3c0440e030ae3bb73d8d89f00114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a069099bcc9936b324e2479a06f3094.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】在平行四边形
中,
,
,
平分
交线段
于点
,在□
的外部作
,使
,
,连接
,
,线段
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/3/ece91ae8-e96d-437d-bde9-ef482f5a69af.png?resizew=426)
(1)当
时,请直接写出线段
和
的数量关系;
(2)当
时,
①请写出线段
,
,
之间的数量关系,并说明理由;
②若点
是
的三等分点,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfbd4f5312bc3852a0613a441179913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ea44749f1c64c8723e84a57d15cb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f105aa84f10a1c0c7876be1d93e35d4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/3/ece91ae8-e96d-437d-bde9-ef482f5a69af.png?resizew=426)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ce131378b290d373b357ff84e534bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449d9e1077ec791367d36557259fbece.png)
①请写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eefc2105d642c1de9cd7b403aa7e752.png)
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解答题-问答题
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困难
(0.15)
名校
【推荐2】如图,四边形
中,
,
,
,点M、N是边
、
上的动点,且
,
、
与对角线
分别交于点P、Q.
![](https://img.xkw.com/dksih/QBM/2021/1/15/2636227017990144/2640303091384320/STEM/bbab636a-0980-4010-a7e9-07e631a9e95b.png?resizew=194)
(1)求
的值:
(2)当
时,求
的度数;
(3)试问:在点M、N的运动过程中,线段比
的值是否发生变化?如不变,请求出这个值;如变化,请至少给出两个可能的值,并说明点N相度的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7786a2ffd3e647d7b6c9ade0f5f59602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6346735747fe509fa58c2f9ff61ccaf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2021/1/15/2636227017990144/2640303091384320/STEM/bbab636a-0980-4010-a7e9-07e631a9e95b.png?resizew=194)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437040c36eb5b3b8623db3119b0094a2.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cf2ffcbb7b7bd9be5e65e8003df2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b18578bc75bf971b8337c35a2db5fea.png)
(3)试问:在点M、N的运动过程中,线段比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586f7796f6bd90df3f798edf8c39b6a0.png)
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【推荐1】以下是“四点共圆”的几个结论,你能证明并运用它们吗?
I.若两个直角三角形有公共斜边,则这两个三角形的4个顶点共圆(图①、②);
Ⅱ.若四边形的一组对角互补,则这个四边形的4个顶点共圆(图③);
Ⅲ.若线段同侧两点与线段两端点连线的夹角相等,则这两点和线段两端点共圆(图④).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/61764130-9ef8-46ff-8eb7-a5ff9a4fce19.png?resizew=585)
(1)在图①、②中,取
的中点O,根据 得
,即A,B,C,D共圆;
(2)在图③中,画⊙O经过点A,B,D(图⑤).假设点C落在
外,
交
于点E,连接
,可得
,所以
,得出矛盾;同理点C也不会落在
内,即A,B,C,D共圆.结论Ⅲ同理可证.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/e3126eee-4b50-4948-8980-663eb77a387b.png?resizew=598)
(3)利用四点共圆证明锐角三角形的三条高交于一点.
已知:如图⑥,锐角三角形
的高
,
相交于点H,射线
交
于点F.
求证:
是
的高.(补全以下证明框图,并在图上作必要标注)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/f687056b-9936-4f88-8130-f0bc76bcac9e.png?resizew=531)
(4)如图⑦,点P是
外部一点,过P作直线
,
,
的垂线,垂足分别为E,F,D,且点D,E,F在同一条直线上.求证:点P在
的外接圆上.
I.若两个直角三角形有公共斜边,则这两个三角形的4个顶点共圆(图①、②);
Ⅱ.若四边形的一组对角互补,则这个四边形的4个顶点共圆(图③);
Ⅲ.若线段同侧两点与线段两端点连线的夹角相等,则这两点和线段两端点共圆(图④).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/61764130-9ef8-46ff-8eb7-a5ff9a4fce19.png?resizew=585)
(1)在图①、②中,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdad2e298d52079589e6de6d69d042e9.png)
(2)在图③中,画⊙O经过点A,B,D(图⑤).假设点C落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/e3126eee-4b50-4948-8980-663eb77a387b.png?resizew=598)
(3)利用四点共圆证明锐角三角形的三条高交于一点.
已知:如图⑥,锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/f687056b-9936-4f88-8130-f0bc76bcac9e.png?resizew=531)
(4)如图⑦,点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
|
困难
(0.15)
解题方法
【推荐2】已知:如图,
内两条弦
、
,且
于
,
为
半径,连接
、
.
;
(2)作
于
,延长
交
于点
.求证:
;
(3)在(2)的条件下,作
交
于点
,点
在
上,连接
交
于点
,当
,
,
时,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3878cef6255181efdd6dba0745cd5c8.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692589394e1db5ac426c7baf6bf1a891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1cf4b05b485f02601a211c1c1ae34.png)
(3)在(2)的条件下,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e859d3091a03fbe0ef7c6291ab0449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eef1f7b9adab87736321e30949a4d668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1077be280d1b6e368a729f32542821b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7811621e60270270233c62a067c11f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79e6839d82589b950e9eafb5ad07317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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