如图,将线段
绕点
逆时针旋转
得
,连接
,作
的外接圆
,点
为劣弧
上的一个动点,弦
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/181f3f58-80bd-4fa2-9e1d-95038293411e.png?resizew=139)
(1)求
的大小;
(2)当点
运动到何处时,
?此时若
,求
的半径;
(3)若圆的半径为4,在点
运动过程中,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0f6710038e74507839def28db6e657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/181f3f58-80bd-4fa2-9e1d-95038293411e.png?resizew=139)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若圆的半径为4,在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
更新时间:2023-01-18 21:17:34
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在Rt△OAB中,∠AOB=90°,以点O为圆心、2为半径画圆,点C是⊙O上任意一点,OC.将OC绕点O按顺时针方向旋转90°,交⊙O于点D
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930347507286016/2946717863550976/STEM/bfcc9efc-b411-43c2-b17c-a61df883bc44.png?resizew=174)
(1)当AD与⊙O相切时,
①求证:BC是⊙O的切线;
②求点C到OB的距离.
(2)连接BD,CD,当△BCD的面积最大时,点B到CD的距离为 .
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930347507286016/2946717863550976/STEM/bfcc9efc-b411-43c2-b17c-a61df883bc44.png?resizew=174)
(1)当AD与⊙O相切时,
①求证:BC是⊙O的切线;
②求点C到OB的距离.
(2)连接BD,CD,当△BCD的面积最大时,点B到CD的距离为 .
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【推荐2】如图,已知
是等边三角形
内一点,
是线段
延长线上一点,且
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06293af3b5c700dde5b77927037ee4a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://img.xkw.com/dksih/QBM/2020/5/16/2464161580695552/2464731230806016/STEM/4ff9532c0b36414088ab4fcb11ea9484.png?resizew=108)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图所示,在菱形
中,
是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/24b9c703-aec3-4be3-982e-93d7db08c10d.png?resizew=499)
(1)如图1,点E、F分别在菱形的边
上滑动,且E、F不与B、C、D重合,求证:
;
(2)如图2,点E是
延长线上一点,连
.
①求证:
;
②若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32900bc4d0685ff9ea703a466479aa75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/24b9c703-aec3-4be3-982e-93d7db08c10d.png?resizew=499)
(1)如图1,点E、F分别在菱形的边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)如图2,点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe765134ee865d3e0bf51ffe14319d0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98adbdae548f2de1cff96a484b9d1df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-证明题
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(0.4)
【推荐2】如图,在
中,
,点P为斜边
上一动点,将
沿直线
折叠,使得点B的对应点为
.
,求证:
;
(2)如图2,连接
,若
,且
,求出
的值;
(3)如图3,连接
,若
,是否存在点P,使得
,若存在,直接写出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403d74859e7b8b4cebf40add6e92b0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253eacd397a587e76aa4a6485651570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c94ff4614059e5e91ed304b150d886.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a830ca32da8e677491673866a78acc66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccc2f02416db8211128e18af2d13ecf.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a830ca32da8e677491673866a78acc66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccc2f02416db8211128e18af2d13ecf.png)
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解答题-作图题
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较难
(0.4)
【推荐3】康康同学在研究等边三角形,如图1,已知
是等边三角形,D为
边的中点,E为中线
上一点(E不可取A点,可取D点),点E关于直线
的对称点是点F.连接
,
,
.
②他发现E点在中线
上运动时,
是一种特殊三角形.
请你回答
是 三角形;
③利用图1证明这个结论.
(2)康康同学发现当E点在中线
上运动时,
的长度也有规律的变化.当
为最大值时,在图2中画出点F,并连接
与
交于点P.
①按要求画出图形;
②在
上存在一点Q,使
的值最小,猜想这最小值____________
(填>,<,=);
③证明②的结论.
(3)在边
上存在一点M,同时满足
的值最大且
的值最小,则此时
与
的数量关系是____________.
![](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/03902478df1a55bc99703210bccab910.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②他发现E点在中线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
请你回答
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
③利用图1证明这个结论.
(2)康康同学发现当E点在中线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83458c4a91d9f50bda7590b59ed5436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①按要求画出图形;
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7daf1bd6cc2e6229afc02131d714f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
③证明②的结论.
(3)在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1aa4039c030724e1c3ed0abbb6e01d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdcc045537a282b7025ec298bc50a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
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较难
(0.4)
【推荐1】如图1,在
中,点D,E分别是边
上的点,且
,连接
,点F在
上,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/6bba31c3-6670-4584-86a7-ebc98d341b1c.png?resizew=342)
(1)求证:
;
(2)如图2,若
,
.
① 求
的值;
② 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d6ceed6e5a36193bcb5a557853dbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432cf339fdfdd3f3325912035c7b12a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e46fb91464159b80eab7c28a926b4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361d6d6eb2e24fd9b16f5dec4a0c9533.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/6bba31c3-6670-4584-86a7-ebc98d341b1c.png?resizew=342)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13430a749d8c4e3ba11b063a20fe0dc8.png)
① 求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c5e73cd3a61a202ae47006ca5d9ed5.png)
② 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0d050fca91c3bed6a2ad6907e6d1f0.png)
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解答题-问答题
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(0.4)
名校
【推荐2】如图1,在平面直角坐标系中,
,
.
(1)点
关于
轴的对称点在第一象限,
为实数
的范围内的最大整数,
点的坐标______,
的面积______.
(2)在(1)的条件下,点
是第一象限的点,且
是以
为腰的等腰直角三角形,点
坐标______.
(3)在(1)的条件下,如图2,
时,以
、
的作等边三角形
和等边
,连接
、
交于
点,连接
.
点是
轴上一动点,
的最小值______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0af3baedbfeb9b0b2869f20e26125ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/ac134f17-4cdc-4b7c-bc77-925294d9ba54.png?resizew=332)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88194e87d2875d066ca6ad2d1a4c63fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(2)在(1)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在(1)的条件下,如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b449b1b22749f6efd914f26b1f71ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481b196bed2a1500dee6722f1525b158.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知
为
的外接圆,
,点D是劣弧
上一点(不与点A,B重合),连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/a3879999-8d40-409d-8805-b202385575bf.png?resizew=390)
(1)如图1,若
是直径,将
绕点C逆时针旋转得到
.若
,求四边形
的面积;
(2)如图2,若
,半径为3,设线段
的长为x,四边形
的面积为S.
①用含有x的代数式表示S;
②若点M,N分别在线段
上运动(不含端点),经过探究发现,点D运动到每一个确定的位置.
的周长有最小值p,随着点D的运动,p的值会发生变化.则所有p值中的最大值是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61537fc86d98a5a52e0b67d70cf76a90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/a3879999-8d40-409d-8805-b202385575bf.png?resizew=390)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
①用含有x的代数式表示S;
②若点M,N分别在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292ec66e4f23a6af92af5381309c2d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知,直角
中,
,
,
,过
,
两点作圆交射线
于点
,交射线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/95bd7ab2-4ad0-4b42-b0de-88a61c57bbf2.png?resizew=511)
(1)如图1,当点
在线段
中点时,求
的长;
(2)如图2,当点
在线段
上时,若点
为
中点,求
的长;
(3)如图3,连接
,若
为等腰三角形,求所有满足条件的
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/95bd7ab2-4ad0-4b42-b0de-88a61c57bbf2.png?resizew=511)
(1)如图1,当点
![](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/d40b319212a7e7528b053e1c7097e966.png)
(2)如图2,当点
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次