【问题提出】在等腰
中,
为
中点,以D为顶点作
,角的两边分别交
于点
,连接
,试探究点D到线段
的距离.
(1)先将问题特殊化,如图2,当点E和A重合时,直接写出D到线段
的距离(用含
的式子表示);
(2)再探究一般情形,如图1,证明(1)中的结论仍然成立;
【问题拓展】如图3,在等腰
中,
为
中点,以D为顶点作
,角的两边分别交直线
于点
,连接
.若
,直接写出
的值(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b14e714077541030828a4d960897ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4206739a0e94a7bd9f8dfc7576e90de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(1)先将问题特殊化,如图2,当点E和A重合时,直接写出D到线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234f1aebda05489b127ae977215e3fd4.png)
(2)再探究一般情形,如图1,证明(1)中的结论仍然成立;
【问题拓展】如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90dc865781ebfe38b4a75d5184a8956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4206739a0e94a7bd9f8dfc7576e90de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cabbf0a453ddfb49830fff20db61265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
2024·湖北武汉·一模 查看更多[1]
更新时间:2024-05-01 20:37:42
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相似题推荐
解答题-问答题
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【推荐1】已知一次函数
的图象与反比例函数
的图象交于A,
两点,一次函数
的图象交y轴于点B.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/370160e1-fa5c-4719-af83-e0e9848b3b10.png?resizew=380)
(1)求点C的坐标和反比例函数的表达式;
(2)如图,直线
交反比例函数图象一象限分支于点F,连接
,作射线
轴.求证:射线
平分
;
(3)目前,数学家探究出三角形的“几何心”有四万余个,某校兴趣小组研究后定义:三角形内有一点,将三角形的某两个顶点分别与该点连接产生两条线段,若两条线段相互垂直且其中有一条线段平分一个内角,则称该点为该三角形的“蓉心”.点D、E分别是反比例函数
一、三象限分支上的点,连接
、
、
,若点B是
的“蓉心”,求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c30fd97fafb3779aa4f4660f41e2939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0b612460326448de36e160c8d29af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635ef90f0464524d843d77e3f0c11d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c30fd97fafb3779aa4f4660f41e2939.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/8/370160e1-fa5c-4719-af83-e0e9848b3b10.png?resizew=380)
(1)求点C的坐标和反比例函数的表达式;
(2)如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c791fbd6c5c91f2f5d3aaf2b899306c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
(3)目前,数学家探究出三角形的“几何心”有四万余个,某校兴趣小组研究后定义:三角形内有一点,将三角形的某两个顶点分别与该点连接产生两条线段,若两条线段相互垂直且其中有一条线段平分一个内角,则称该点为该三角形的“蓉心”.点D、E分别是反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0b612460326448de36e160c8d29af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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名校
【推荐2】综合与实践
和
均为等腰三角形,
,
,
,点
、
、
在同一条直线上,连接
.
①求证:
;将下列解答过程补充完整.
证明:
,
________,
,
在
和
中,
,
,
;
②若
,则
的度数为________.
(2)类比探究:如图2,
和
均为等腰直角三角形,
,点
、
、
在同一条直线上,
为
中
边上的高,连接
.请判断
、
与
三条线段的数量关系,并说明理由.
(3)拓展延伸:在(2)的条件下,若
,
,请直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ead706ccc238d868654030a3626847c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f145e6d68a0903d4d10f27cf647ddc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f07ff13e869293de52d1314fe06892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6f8ae133e11398981b3dfd54b7dc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c94f0919c16e86452da239864dad6a3.png)
在
![](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/e5b0bf9673997ba4dd9160032f4b3b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736615c0d108958a028881eb2585b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedb246326d58aa8c14230e4fc639d4f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3223054560c8296227763d4cbb90194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)类比探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(3)拓展延伸:在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee73d637e8260733851b10b322b9cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
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【推荐3】概念学习
规定:如果一个三角形的三个角分别等于另一个三角形的三个角,那么称这两个三角形互为“等角三角形”.
从三角形(不是等腰三角形)一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原来三角形是“等角三角形”,我们把这条线段叫做这个三角形的“等角分割线”.
理解概念
(1)如图1,在
中,
,
,请写出图中两对“等角三角形”.
概念应用
(2)如图2,在
中,
为角平分线,
,
.求证:
为
的等角分割线.
(3)在
中,
,
是
的等角分割线,直接写出
的度数.
规定:如果一个三角形的三个角分别等于另一个三角形的三个角,那么称这两个三角形互为“等角三角形”.
从三角形(不是等腰三角形)一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原来三角形是“等角三角形”,我们把这条线段叫做这个三角形的“等角分割线”.
理解概念
(1)如图1,在
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
概念应用
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713bb0199e6f0280f5556db313bbe694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/e753cc12-daee-4cab-9603-880706e5be1b.png?resizew=312)
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【推荐1】如图,已知
是
的角平分线,点
是斜边
上的动点,以点
为圆心,
长为半径的
经过点
,与
相交于点
.
与
的位置关系,为什么?
(2)若
,
.①求
的半径
的长;②求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】在
中,
,过点B的直线
,D为直线BC上的一点(不与点B重合),连结AD,过点D作
交MN于点E,连结AE.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2894217185665024/2959173003444224/STEM/29b72f7f-c012-4689-b45d-0e0e81f78f75.png?resizew=608)
(1)如图1,当点D在线段BC上时,过点D作
交AB于点F,已知
,求证:
;
(2)如图2,当点D在线段BC上时,若
,请说明线段AD与DE之间的数量关系;
(3)当点D不在线段BC上时,若
,则线段AD,DE和
之间的数量关系是__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ce32435647d7324b3c40a3fa758fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2894217185665024/2959173003444224/STEM/29b72f7f-c012-4689-b45d-0e0e81f78f75.png?resizew=608)
(1)如图1,当点D在线段BC上时,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
(2)如图2,当点D在线段BC上时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
(3)当点D不在线段BC上时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐1】(1)知识再现
如图(1):若点A,B在直线l同侧,A,B到l的距离分别是3和2,AB=4,现在直线l上找一点P,使AP+BP的值最小,做法如下;
作点A关于直线l的对称点A′,连接BA′,与直线l的交代就是所求的点P,线段BA′的长度即为AP+BP的最小值,请你求出这个最小值.
(2)实践应用
①如图(2),⊙O的半径为2,点A、B、C在⊙O上,OA⊥OB,∠AOC=60°,P是OB上一动点,则PA+PC的最小值是 ;
②如图(3),Rt△OAB的顶点A在x轴的正半轴上,顶点B的坐标为(3,
),点C的坐标为(1,0),点P为斜边OB上的一动点,则PA+PC的最小值为 ;
③如图(4),菱形ABCD中AB=2,∠A=120°,点P,Q,K,分别为线段BC,CD,BD上的任意一点,则PK+QK的最小值为 ;
④如图(5),在Rt△ABC中,∠C=90°,∠B=60°,点D是BC边上的点,CD=
,将△ABC沿直线AD翻折,使点C落在AB边上的点E处,若点P是直线AD上的动点,则△PEB的周长的最小值是 .
(3)拓展延伸
如图(6),在四边形ABCD的对角线AC上找一点P,使∠APB=∠APD,保留作图痕迹,不必写出作法.
如图(1):若点A,B在直线l同侧,A,B到l的距离分别是3和2,AB=4,现在直线l上找一点P,使AP+BP的值最小,做法如下;
作点A关于直线l的对称点A′,连接BA′,与直线l的交代就是所求的点P,线段BA′的长度即为AP+BP的最小值,请你求出这个最小值.
(2)实践应用
①如图(2),⊙O的半径为2,点A、B、C在⊙O上,OA⊥OB,∠AOC=60°,P是OB上一动点,则PA+PC的最小值是 ;
②如图(3),Rt△OAB的顶点A在x轴的正半轴上,顶点B的坐标为(3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
③如图(4),菱形ABCD中AB=2,∠A=120°,点P,Q,K,分别为线段BC,CD,BD上的任意一点,则PK+QK的最小值为 ;
④如图(5),在Rt△ABC中,∠C=90°,∠B=60°,点D是BC边上的点,CD=
![](https://img.xkw.com/dksih/QBM/2015/9/28/1573917405634560/1573917411467264/STEM/082ff3d0f06844d680d6e7910ad89ceb.png)
(3)拓展延伸
如图(6),在四边形ABCD的对角线AC上找一点P,使∠APB=∠APD,保留作图痕迹,不必写出作法.
![](https://img.xkw.com/dksih/QBM/2015/9/28/1573917405634560/1573917411467264/STEM/3aa6d45cf8ca474fa35ac600ae4cefb0.png)
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解答题-问答题
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【推荐2】生活中,有人用纸条可以折成正五边形的形状,折叠过程是将图①中的纸条按图②方式拉紧,压平后可得到图③中的正五边形(阴影部分表示纸条的反面).
![](https://img.xkw.com/dksih/QBM/2012/11/12/1573555032195072/1573555120480256/STEM/2d575826234e425c8845f7a28603dfc0.png)
(1)将
两端剪掉则可以得到正五边形
,若将
展开,展开后的平面图形是 ;
(2)若原长方形纸条(图①)宽为2cm,求(1)中展开后平面图形的周长(可以用三角函数表示).
![](https://img.xkw.com/dksih/QBM/2012/11/12/1573555032195072/1573555120480256/STEM/2d575826234e425c8845f7a28603dfc0.png)
(1)将
![](https://img.xkw.com/dksih/QBM/2012/11/12/1573555032195072/1573555120480256/STEM/635a2c79af18403cbd667c3f9257f697.png)
![](https://img.xkw.com/dksih/QBM/2012/11/12/1573555032195072/1573555120480256/STEM/881654167a97489d9ba875543e802d3a.png)
![](https://img.xkw.com/dksih/QBM/2012/11/12/1573555032195072/1573555120480256/STEM/881654167a97489d9ba875543e802d3a.png)
(2)若原长方形纸条(图①)宽为2cm,求(1)中展开后平面图形的周长(可以用三角函数表示).
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