学习了正多边形之后,小马同学发现利用对称、旋转等方法可以计算等分正多边形面积的方案.
(1)请聪明的你将下面图①、图②、图③的等边三角形分别割成2个、3个、4个全等三角形;
(2)如图④,等边△ABC边长AB=4,点O为它的外心,点M、N分别为边AB、BC上的动点(不与端点重合),且∠MON=120°,若四边形BMON的面积为s,它的周长记为l,求
最小值;
(3)如图⑤,等边△ABC的边长AB=4,点P为边CA延长线上一点,点Q为边AB延长线上一点,点D为BC边中点,且∠PDQ=120°,若PA=x,请用含x的代数式表示△BDQ的面积S△BDQ.
(1)请聪明的你将下面图①、图②、图③的等边三角形分别割成2个、3个、4个全等三角形;
(2)如图④,等边△ABC边长AB=4,点O为它的外心,点M、N分别为边AB、BC上的动点(不与端点重合),且∠MON=120°,若四边形BMON的面积为s,它的周长记为l,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751ccb261e861d98df497747aa70d7a7.png)
(3)如图⑤,等边△ABC的边长AB=4,点P为边CA延长线上一点,点Q为边AB延长线上一点,点D为BC边中点,且∠PDQ=120°,若PA=x,请用含x的代数式表示△BDQ的面积S△BDQ.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421324835315712/2421713524432896/STEM/3643717326ff4285aca3d20b627fff12.png?resizew=590)
更新时间:2020-03-17 22:11:41
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相似题推荐
解答题-证明题
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解题方法
【推荐1】如图,△ABC中,O是△ABC内一点,AO平分∠BAC,连OB,OC.
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511169640726528/2511980741386240/STEM/a3a0aa28937048f5a94a485e5f2da67a.png?resizew=522)
(1)如图1,若∠ACB=2∠ABC,BO平分∠ABC,AC=5,OC=3,则AB= ;
(2)如图2,若∠CBO+∠ACO=∠BAC=60°,求证:BO平分∠ABC;
(3)如图3,在(2)的条件下,若BC=2
,将点B绕点O逆时针旋转60°得点D,直接写出CD的最小值为 .
![](https://img.xkw.com/dksih/QBM/2020/7/22/2511169640726528/2511980741386240/STEM/a3a0aa28937048f5a94a485e5f2da67a.png?resizew=522)
(1)如图1,若∠ACB=2∠ABC,BO平分∠ABC,AC=5,OC=3,则AB= ;
(2)如图2,若∠CBO+∠ACO=∠BAC=60°,求证:BO平分∠ABC;
(3)如图3,在(2)的条件下,若BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图1,点M在直线AB上,点P,N在直线CD上,过点N作NE∥PM,连接ME.
(1)若AB∥CD,点E在直线AB,CD之间,求证:∠MEN=∠BME+∠MPN;
(2)如图2,ME的延长线交直线CD于点Q,作NG平分∠ENQ交EQ于点G,作EF平分∠MEN,过点E作HE∥NG.若点F,H分别在MP,PQ上,探究当∠MPQ+2∠FEH=90°时,线段NE与NG的大小关系.
(1)若AB∥CD,点E在直线AB,CD之间,求证:∠MEN=∠BME+∠MPN;
(2)如图2,ME的延长线交直线CD于点Q,作NG平分∠ENQ交EQ于点G,作EF平分∠MEN,过点E作HE∥NG.若点F,H分别在MP,PQ上,探究当∠MPQ+2∠FEH=90°时,线段NE与NG的大小关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c31e9bb2-09af-47bf-a65b-af15d1b881f9.png?resizew=497)
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【推荐3】如图1所示,A、B两点同时从原点O出发,点A以每秒x个单位长度沿x轴的负方向运动,点B以每秒y个单位长度沿y轴的正方向运动.
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296975121801216/2298471676936192/STEM/7ddbb91375e74f6e9946b47174a4030a.png?resizew=481)
(1)若|x+2y-10|+|2x-y|=0,试分别求出1秒钟后△AOB的面积;
(2)如图2,所示,设∠BAO的邻补角和∠ABO的邻补角的平分线相交于点P,问:点A、B在运动的过程中,∠P的大小是否会发生变化?若不发生变化,请求出其值;若发生变化,请说明理由;
(3)如图3所示,延长BA至E,在∠ABO的内部作射线BF交x轴于点C,若∠EAC、∠FCA、∠ABC的平分线相交于点G,过点G作BE的垂线,垂足为H,设∠AGH=α,∠BGC=β,试探究出α和β满足的数量关系并给出证明.
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296975121801216/2298471676936192/STEM/7ddbb91375e74f6e9946b47174a4030a.png?resizew=481)
(1)若|x+2y-10|+|2x-y|=0,试分别求出1秒钟后△AOB的面积;
(2)如图2,所示,设∠BAO的邻补角和∠ABO的邻补角的平分线相交于点P,问:点A、B在运动的过程中,∠P的大小是否会发生变化?若不发生变化,请求出其值;若发生变化,请说明理由;
(3)如图3所示,延长BA至E,在∠ABO的内部作射线BF交x轴于点C,若∠EAC、∠FCA、∠ABC的平分线相交于点G,过点G作BE的垂线,垂足为H,设∠AGH=α,∠BGC=β,试探究出α和β满足的数量关系并给出证明.
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【推荐1】如图,已知
为等腰直角三角形,
且
,
为
上一点,且
,过
作
且
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718893352689664/2722303824953344/STEM/31bfcf69-c95c-44c7-bddf-46ab99ea8323.png)
(1)如图1,已知
,连接
、
,求
的面积;
(2)如图2所示,
为
上一点,连接
,作
交
于
点,求证:
;
(3)已知
面积为
,
为射线
上一点,作
,交射线
于
,连接
,点
为
的中点,当
有最小值时,请直接写出
的面积.
![](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/c10d461a7c0b86a2f09c2ea17f38260e.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/7595bdaea3dfa548c0fcfe3708387476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa1b5b6051d500fe6c6f1c19c7ee49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718893352689664/2722303824953344/STEM/31bfcf69-c95c-44c7-bddf-46ab99ea8323.png)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(2)如图2所示,
![](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/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107df819eec2e2078b9ca0b4e08a5b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b92470791a1b6dc97fd362c6ba16fd8f.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b43432af566fe0b3a5ee6a8eb9cb95a.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/107df819eec2e2078b9ca0b4e08a5b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7516bfacb88ea94d2d5156408e9ee25e.png)
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解答题-证明题
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【推荐2】如图1,在矩形
中,
,点
为
的中点,将
沿
翻折至
,直线
分别交直线
,直线
于点
,
,连接
.
(1)试判断
与
的位置关系,并说明理由.
(2)如图2,连接
分别交
,
于点
,
,若
,
①求证:
.
②求
的长.
(3)设直线
交
于点
,连接
,记
的面积为
,
的面积为
,连接
,当
中有一个内角的正切值为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a58326dee5068ef295f9afd4877671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a95ba11eab5eb1b50c9e612b13e32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/19ce3598-7d19-48a7-884a-0ded511dde73.png?resizew=372)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b757706eee506a078fc25e3f33a70cb.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b8b30d57339ae81d78511c9bd61a9e.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445d7497f41656d5d3115dafef213972.png)
(3)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bc313f73ba34b49cf9fd322d8835e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb170c35cb151d6e34512c3f0c35dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463988d6280855445e70c7579e5d6915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a373659735da359bb02e778513c9fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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解答题-问答题
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解题方法
【推荐3】如图,矩形ABCD中,AB=4,AD=3,∠DAB的角平分线交边CD于点E.点P在射线AE上以每秒
个单位长度的速度沿射线AE方向从点A开始运动;过点P作PQ⊥AB于点Q,以PQ为边向右作平行四边形
,点N在射线AE上,且AP=PN.设P点运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2020/6/16/2485969546878976/2490967826153472/STEM/00a2055366bd4bd0b85e55621ea822e5.png?resizew=139)
(1)PQ= (用含t的代数式表示).
(2)当点M落在BC边上时,求t的值.
(3)设平行四边形PQMN与矩形ABCD重合部分面积为S,当点P在线段AE上运动时,求S与t 的函数关系式.
(4)直接写出在点P、Q运动的过程中,整个图形中形成的三角形存在全等三角形时t的值(不添加任何辅助线).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://img.xkw.com/dksih/QBM/2020/6/16/2485969546878976/2490967826153472/STEM/00a2055366bd4bd0b85e55621ea822e5.png?resizew=139)
(1)PQ= (用含t的代数式表示).
(2)当点M落在BC边上时,求t的值.
(3)设平行四边形PQMN与矩形ABCD重合部分面积为S,当点P在线段AE上运动时,求S与t 的函数关系式.
(4)直接写出在点P、Q运动的过程中,整个图形中形成的三角形存在全等三角形时t的值(不添加任何辅助线).
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【推荐1】在平面直角坐标系中,点O为坐标原点,直线y=﹣
x+12与x轴,y轴分别相交于点A,B,∠ABO的平分线与x轴相交于点C.
(1)如图1,求点C的坐标;
(2)如图2,点D,E,F分别在线段BC,AB,OB上(点D,E,F都不与点B重合),连接DE,DF,EF,且∠EDF+∠OBC=90°,求证:∠FED=∠AED;
(3)如图3,在(2)的条件下,延长线段FE与x轴相交于点G,连接DG,若∠CGD=∠FGD,BF:BE=5:8,求直线DF的解析式.
![](https://img.xkw.com/dksih/QBM/2018/4/15/1924722463055872/1925541197660160/STEM/72296d18a2d945249e0935b2477a5996.png?resizew=122)
![](https://img.xkw.com/dksih/QBM/2018/4/15/1924722463055872/1925541197660160/STEM/5a49900c9bec465ebc267c0351e3621e.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(1)如图1,求点C的坐标;
(2)如图2,点D,E,F分别在线段BC,AB,OB上(点D,E,F都不与点B重合),连接DE,DF,EF,且∠EDF+∠OBC=90°,求证:∠FED=∠AED;
(3)如图3,在(2)的条件下,延长线段FE与x轴相交于点G,连接DG,若∠CGD=∠FGD,BF:BE=5:8,求直线DF的解析式.
![](https://img.xkw.com/dksih/QBM/2018/4/15/1924722463055872/1925541197660160/STEM/72296d18a2d945249e0935b2477a5996.png?resizew=122)
![](https://img.xkw.com/dksih/QBM/2018/4/15/1924722463055872/1925541197660160/STEM/5a49900c9bec465ebc267c0351e3621e.png?resizew=123)
![](https://img.xkw.com/dksih/QBM/2018/4/15/1924722463055872/1925541197660160/STEM/c8dd0b8ddfd143f4881db2b8f3210585.png?resizew=195)
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解答题-作图题
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困难
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【推荐2】在平面直角坐标系
中,点
,点
,点
,点
,
为四边形
边上一点.对于点
给出如下定义:若
,
,点
在
轴下方,点
关于原点的对称点为
,我们称点
为点
关于点
为直角顶点的“变换点”.
(1)①在图中分别画出点
关于点
和点
直角顶点的“变换点”
、
;
②连结
,用等式表示线段
与
之间的数量关系,并证明;
(2)直线
(
)上存在点
关于点
为直角顶点的“变换点”,直接写出k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6b7670302e7015123b9446afab1f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980f8aaeca69f195335110f8051daf39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5bd9df372dcb66f118f3be8c2e8f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce27812d3b26805fe9d7e50c8e49fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5bd684010d20edffb9a1e25086289f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/043ca7ef-5271-454d-9806-1cc7703c345e.png?resizew=201)
(1)①在图中分别画出点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
②连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a523eb28f4a7f0ba05ae63088321a82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a523eb28f4a7f0ba05ae63088321a82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41825f0c6368611094133ee11b9638cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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