如图,点
分别在等边
的边
上,
与
交于点
,
,
,
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5143d076f4916c31cf8ef04bf2949f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982635c07eaa7715b1ffd9dbabc3bcaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://img.xkw.com/dksih/QBM/2019/8/23/2274901223849984/2274942948999168/STEM/d890784f2be34816b7278293e49932a2.png?resizew=217)
更新时间:2019-08-23 13:26:11
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相似题推荐
解答题-问答题
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【推荐1】阅读下面材料:某同学遇到这样一个问题:如图1,
中,
,点D在
边上,过点B作
交
延长线于点E,当
时,图1中是否存在与
相等的线段?若存在,请找出并说明理由,若不存在,说明理由.该同学通过探究发现,过点A作
的垂线
,垂足为F,能得到一对全等三角形(如图2),从而将问题解决.
(1)该同学发现的与
相等的线段是 ;
(2)证明该同学所发现的结论;
(3)参考该同学思考问题的方法,解决下面的问题:如图3,在
中,
,
,点D在
上,点E是
外一点,且
,
,点F是
中点,G在
上,连接
、
.
,求
的值.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1853f7e20d795df45a7c139c7af8f6.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/6aa2b5e09f8ec785c59900a529390a02.png)
(1)该同学发现的与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)证明该同学所发现的结论;
(3)参考该同学思考问题的方法,解决下面的问题:如图3,在
![](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/9c06154cae3bf7a8ce5a1e97a7380875.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/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d99bb9520228c1803a48e1d5c1d962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96ec8aa5665224cc95db31fd3e64c93.png)
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解题方法
【推荐2】如图所示,在
中,
,
,
、
分别是
、
边的中点.将
绕点
顺时针旋转
角
,得到
(如图所示).
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222633389875200/2222659919880192/STEM/2dee081a688943cf8ca2a54e9da70f88.png?resizew=370)
(1)探究
与
的数量关系,并给予证明;
(2)当
时,试求旋转角
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c5acb96aba643a626f2452312aa775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b5cf411c2fea8bc9f4a5fb497515a8.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222633389875200/2222659919880192/STEM/2dee081a688943cf8ca2a54e9da70f88.png?resizew=370)
(1)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7752aa0b8a01afc2fa4e44212cc9333b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82f44bdcad1ef917b6c58af614a990d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐1】如图,在平面直角坐标系中,点
在反比例函数
的图象上,其纵坐标为2,过点
作
轴,交
轴于点
,将线段
绕点
顺时针旋转
得到线段
.若点
恰好落在该反比例函数的图象上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/288d5e52-ad93-4be0-a43f-534a25e918d9.png?resizew=132)
(1)求
的值;
(2)作
轴,
为垂足,直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a37e8519ea115c1777d031d9963583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/288d5e52-ad93-4be0-a43f-534a25e918d9.png?resizew=132)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926f34fd0accc5678a6f1f232dc0a42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001b9db31e57fc045b567c4c58a37f54.png)
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【推荐2】如图1,在平面直角坐标系中,A(4,0),点B在第一象限,△OAB为等边三角形,OC是△OAB的AB边上的高.
(1)求出点C的横坐标;
(2)图2中,作点C关于y轴的对称点D,连结DA、DC分别交OB于点E、F,求线段OE的长;
(3)图3中,在OC上取点M,连结BM,以BM为边向右作等边△BMN,连结AN,CN,求证:OA⊥AN,并直接写出CN的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/6cb09d75-08f0-4ca4-ac7c-96a3da7b941e.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/0bbb83f5-9809-4282-baf0-00db1f5f6783.png?resizew=186)
(1)求出点C的横坐标;
(2)图2中,作点C关于y轴的对称点D,连结DA、DC分别交OB于点E、F,求线段OE的长;
(3)图3中,在OC上取点M,连结BM,以BM为边向右作等边△BMN,连结AN,CN,求证:OA⊥AN,并直接写出CN的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/6cb09d75-08f0-4ca4-ac7c-96a3da7b941e.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/0bbb83f5-9809-4282-baf0-00db1f5f6783.png?resizew=186)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/ab11b108-d58a-499a-8754-3db2bb9aa490.png?resizew=166)
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【推荐1】如图,
ABC内接于⊙O,点D在半径OB的延长线上,∠BCD=∠A=30°.
(2)若CD=2
,求由弧BC、线段CD和BD所围成的阴影部分面积(结果保留π和根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db999650f7f40ac6aaf3ff856ea4ca40.png)
(2)若CD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
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【推荐2】已知,点P是等边三角形△ABC中一点,线段AP绕点A逆时针旋转60°到AQ,连接PQ、QC.
(1)求证:PB=QC;
(2)若PA=3,PB=4,∠APB=150°,求PC的长度.
(1)求证:PB=QC;
(2)若PA=3,PB=4,∠APB=150°,求PC的长度.
![](https://img.xkw.com/dksih/QBM/2019/1/21/2123346076368896/2126642295513088/STEM/454fb9f870a747e686d1fff38ca6338f.png?resizew=144)
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【推荐3】已知点A、D在直线l的同侧.
(1)如图1,在直线l上找一点C.使得线段AC+DC最小(请通过画图指出点C的位置);
(2)如图2,在直线l上取两点B、E,恰好能使△ABC和△DCE均为等边三角形.M、N分别是线段AC、BC上的动点,连结DN交AC于点G,连结EM交CD于点F.
①当点M、N分别是AC、BC的中点时,判断线段EM与DN的数量关系,并说明理由;
②如图3,若点M、N分别从点A和B开始沿AC和BC以相同的速度向点C匀速运动,当M、N与点C重合时运动停止,判断在运动过程中线段GF与直线1的位置关系,并说明理由.
(1)如图1,在直线l上找一点C.使得线段AC+DC最小(请通过画图指出点C的位置);
(2)如图2,在直线l上取两点B、E,恰好能使△ABC和△DCE均为等边三角形.M、N分别是线段AC、BC上的动点,连结DN交AC于点G,连结EM交CD于点F.
①当点M、N分别是AC、BC的中点时,判断线段EM与DN的数量关系,并说明理由;
②如图3,若点M、N分别从点A和B开始沿AC和BC以相同的速度向点C匀速运动,当M、N与点C重合时运动停止,判断在运动过程中线段GF与直线1的位置关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/25/2233246475083776/2233475507625984/STEM/a2d0545d3e6e4f3c8c80f8f623b90440.png?resizew=477)
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