如图1,四边形
内接于
,
为
的直径,点F在
上,射线
交
的延长线于点E,
平分
.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698778589282304/2702338184495104/STEM/1de1362e-e70a-4f25-8457-9d2d97b99b54.png)
(1)求证:
;
(2)如图2,若
=
,求证:
;
(3)如图3,在(2)的条件下,若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698778589282304/2702338184495104/STEM/1de1362e-e70a-4f25-8457-9d2d97b99b54.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f40622681bcdce18b8f06c81edfb47.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877bda8e7700dc36fc02bf27a1770365.png)
(3)如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc4480a4d324df21a62f284174186aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2021-04-18 09:44:01
|
相似题推荐
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图,在△ABC中,AC=BC,∠ACB=90°,点D是AB的中点,点E是AB边上的一动点.连接CE,过点B作BF⊥CE,垂足为F交直线CD于点G.
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426500977655808/2432585015787520/STEM/e44eb52d1f024faeaff2e56884d83850.png?resizew=416)
(1)如图l,当点E在线段AD上时,请直接判断AE与CG的数量关系;
(2)如图2,当点E在线段DB上时,(1)中AE与CG的数量关系是否依然成立,若成立,请证明;若不成立,请说明理由.
(3)当AC=2
,且四边形DEFG的面积为
时,请直接写出线段AE的长.
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426500977655808/2432585015787520/STEM/e44eb52d1f024faeaff2e56884d83850.png?resizew=416)
(1)如图l,当点E在线段AD上时,请直接判断AE与CG的数量关系;
(2)如图2,当点E在线段DB上时,(1)中AE与CG的数量关系是否依然成立,若成立,请证明;若不成立,请说明理由.
(3)当AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba564f8149fb98ee50c4012f06708382.png)
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【推荐2】如图,点E是正方形ABCD的边BC上一点,连接DE,将DE绕着点E逆时针旋转90°,得到EG,过点G作GF⊥CB,垂足为F,GH⊥AB,垂足为H,连接DG,交AB于I.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/ae178f81-7ae7-47e3-8e54-bb4934a7ee1f.png?resizew=217)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/556c1dde44e3d4d73ea8a015f2efdf2b.png)
(2)求证:四边形BFGH是正方形;
(3)求证:ED平分∠CEI
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/ae178f81-7ae7-47e3-8e54-bb4934a7ee1f.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/556c1dde44e3d4d73ea8a015f2efdf2b.png)
(2)求证:四边形BFGH是正方形;
(3)求证:ED平分∠CEI
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解答题-问答题
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【推荐1】如图,在
中,
,
,
.点D是边
上一动点(不与A、C重合),联结
,过点C作
,分别交
、
于点E、F.
时,求
的正切值;
(2)设
,
,求y关于x的函数解析式,并写出x的定义域;
(3)联结
并延长,与边
的延长线相交于点G,若
与
相似,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.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/aac18b0388014ae20b2add2975ef56aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4a7d7c2253a1686c61f8b8f3f6c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e041dbf4398164c958cbca5f5b4f953.png)
(3)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbe493541ce13a176048d14fbdf003f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc3f93ceb05f20799a28a6aa99cab44.png)
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名校
【推荐2】【材料阅读】
材料
:以角内一点为圆心画圆,若圆与该角的两边相交所截的两条弦相等,则这一点在该角的角平分线上.如图
,
为
内一点,
在射线
截得弦
,则
在
角平分线
上.
材料
:有一个圆分别和一个三角形的三条边各有两个交点,截得的三条弦相等,我们把这个圆叫作这个三角形的“等弦圆”.
认真研读以上材料,完成以下问题:
【问题1】对于“等弦圆”下列描述正确得有_____________________________(填序号)
每个三角形都有“等弦圆”;
一个三角形的“等弦圆”的圆心就是这个三角形的内心;
每个三角形都只有一个“等弦圆”;
若一个三角形的三个顶点可以同时在它的“等弦圆”上,那么这个三角形一定是等边三角形.
【问题2】如图2,
是
经过
两点的“等弦圆”,交边
于
.求证:
.
【问题3】已知等腰直角三角形腰为2,则“等弦圆”半径的取值范围为_____________________;
【问题4】如图
,
中,
,
是
经过
点的“等弦圆”,交边
于
,交边
于
,交边
于
(
在
的右边).
(1)连结
,则
_______________________
;
(2)若
,求弦
与弧
围成阴影部分的面积.
材料
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091145fcc157587a3fc8e0b7c7c0ecb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33aac544eba6d1b2c0fdebd23477cee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/7c720cff-447b-43b5-a25d-09cbf49acd3f.png?resizew=219)
材料
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
认真研读以上材料,完成以下问题:
【问题1】对于“等弦圆”下列描述正确得有_____________________________(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.png)
【问题2】如图2,
![](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/da6b93dbe5272a5167ff4e2918bec864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/ece0be78-ba3d-452f-a2bc-4f90d827c879.png?resizew=120)
【问题3】已知等腰直角三角形腰为2,则“等弦圆”半径的取值范围为_____________________;
【问题4】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/c741cf8348e9fa4ee6894ac2c3ac6dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/1d10b3ee-5d0d-412b-956e-0b7cdfa0811c.png?resizew=234)
(1)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cfcc0a789ac370cb827d3607996343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ac2a66b76e9498a3db169abc52f130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ccbfff23a7138566e2f6a2932f88d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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【推荐1】将直尺摆放在三角板上,使直尺与三角板的边分别交于点D、E、F、G,如图①所示.已知∠CGD=42.
(1)求∠CEF的度数.
(2)将直尺向下平移,使直尺的边缘通过点B,交AC于点H,如图②所示.点H、B的读数分别为4、13.4,求BC的长(精确到0.1)【参考数据:sin42°=0.67,cos42°=0.74,tan42°=0.90】
(1)求∠CEF的度数.
(2)将直尺向下平移,使直尺的边缘通过点B,交AC于点H,如图②所示.点H、B的读数分别为4、13.4,求BC的长(精确到0.1)【参考数据:sin42°=0.67,cos42°=0.74,tan42°=0.90】
![](https://img.xkw.com/dksih/QBM/2020/2/17/2401025274699776/2401722973200384/STEM/401664d0be504a4db77d2fbee3121f24.png?resizew=380)
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【推荐2】【感知】如图①,
内接于半径为R的
, 点A 是
上动点, 且点A、D位于
两侧,则弦
的最大值为______;(用含R的代数式表示)
【探究】如图②,
内接于
, 点A是
上动点, 且点A、D位于
两侧.若
的半径为6,
,求点A 到
距离的最大值.下面是小明的部分求解过程:
解: 连结
, 过点A作
于点H.
过点O作
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d955d197e2ecbfe724570663efcf2a2d.png)
并反向延长,交
于点
,连结
.
证明过程缺失
∴点A到
距离的最大值为9.
请你补全解答过程.
【拓展】如图③,现计划建一个四边形空地
,按规划要求:
,
,
,
,调整点D的位置,使四边形
的面积最大,则这个最大面积为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1389d663411aaf232fd509b08ed026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【探究】如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1389d663411aaf232fd509b08ed026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1389d663411aaf232fd509b08ed026.png)
解: 连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cdd1cafc1898d9a5e960b7aef0ade5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
过点O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0681c3587e6ff2c7d9e6e87aa7057a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d955d197e2ecbfe724570663efcf2a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
证明过程缺失
∴点A到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1389d663411aaf232fd509b08ed026.png)
请你补全解答过程.
【拓展】如图③,现计划建一个四边形空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a165f441db0e5fb0b855f133bcc934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb425646bdc3c4f06987ed3061750bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae39c7e44a8cdf1fce02ce64ae148f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
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解答题-证明题
|
较难
(0.4)
【推荐3】已知:如图,在四边形
和
中,
,
,点
在
上,
,
,
,延长
交
于点
.点
从点
出发,沿
方向匀速运动,速度为
;同时,点
从点
出发,沿
方向匀速运动,速度为
.过点
作
于点
,交
于点
.设运动时间为
.
解答下列问题:
(1)①判断:直线
与
的位置关系是 ;
②当点
在线段
的垂直平分线上时,求
的值;
(2)连接
,作
于点N,当四边形
为矩形时,求t的值;
(3)点
在运动过程中,是否存在某一时刻
,使点
在
的平分线上?若存在,求出
的值;若不存在,请说明理由;
(4)连接
,
,设四边形
的面积为
,直接写出运动过程中
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9189b25951339f71d150d33f1c6ea530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb53077d8d62f44415f4d56c6b5c081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa65fc855ee3dc1c62a525e1aa671b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793eb547b9eacf5106c80fed095017ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01a7a8fdfb1fbde557f1423a8c8b9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51b844127904bfd3abce1d35a0acac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdc31e6195dccc59a340cf78ec98dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf193ff4546dfb09008d6354f374b280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e780a16aa309b7e69c656cea294d72.png)
解答下列问题:
(1)①判断:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53805f2f4e8b4c964ed8d4639420f1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ffc3e33718d90d9bdeb05ddeb53299.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bdbbd3084ddc946e12d530d2192522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff2736998f1ae2c0ad52c5aa47e58c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5b294fc00b77f36284e80014998185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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