直线l是线段BC的垂直平分线,点A是直线l上的一个动点,连接AB、AC,以AC为边向上方作等边△ACE,线段BE(或BE的延长线)与直线1相交于F,点F′与点F关于BC对称,如下图,图一是点A运动到点F与点F′之间的情景,图二是点A运动到点F′下方时的情景,请根据要求回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/5dce7c45-9e5d-4d5f-a676-3c3a102a191f.png?resizew=379)
(1)如图一,求证:△FBA≌△FCA;
(2)如图一,求证:∠FEA=∠FCA;
(3)如图二,猜想∠FEA与∠FCA还相等吗?如不相等,请说出它们的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/5dce7c45-9e5d-4d5f-a676-3c3a102a191f.png?resizew=379)
(1)如图一,求证:△FBA≌△FCA;
(2)如图一,求证:∠FEA=∠FCA;
(3)如图二,猜想∠FEA与∠FCA还相等吗?如不相等,请说出它们的数量关系,并说明理由.
更新时间:2022-04-17 02:10:33
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【推荐1】(1)问题背景:如图甲,
,
,垂足为
,且
,
,求四边形
的面积.
(2)类比迁移:如图乙,
为等边
外一点,
,
,且
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4d67cda359da23b9879419ee4c60e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
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![]() 小明发现四边形 ![]() ![]() ![]() ![]() ![]() 第二步:利用 ![]() ![]() ![]() ![]() ![]() |
请直接写出四边形的面积为______.
(2)类比迁移:如图乙,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d10f2db7289ff1ec65c47d9af77a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc2678691226b1d08e6d84242692a43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b47e792146e2f7d93a9ef9ad1294ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76981622e3684aca12435743b6a08a8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/a5be5cf9-b20e-445f-bc9f-5c9222b93422.png?resizew=133)
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【推荐2】“综合与实践”学习活动准备制作一组三角形,记这些三角形的三边分别为
,
,
,用记号
表示一个满足条件的三角形,如
表示边长分别为2,4,4个单位长度的一个三角形.
(1)若这些三角形三边的长度为大于0且小于3的整数个单位长度,请用记号写出所有满足条件的三角形;
(2)如图,
是
的中线,线段
,
的长度分别为2个,6个单位长度,且线段
的长度为整数个单位长度,过点
作
交
的延长线于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①求
之长;
②请直接用记号表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8974bfa5e0627a20c0c8a8032fa90b76.png)
(1)若这些三角形三边的长度为大于0且小于3的整数个单位长度,请用记号写出所有满足条件的三角形;
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②请直接用记号表示
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【推荐1】在直角坐标系
中,
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,
,
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(1)作
关于
轴对称的
,并写出顶点
,
,
的坐标;
(2)若以
,
,
为顶点的三角形与
全等,请直接写出所有符合条件的点
的坐标.(点
与点
不重合.)
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(1)作
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(2)若以
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【推荐2】如图,在
中,
,点
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在
上.
(1)
与
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(2)请说明
的理由.
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(1)
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(2)请说明
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【推荐1】如图,已知
平分
,
的垂直平分线
交
的延长线于点P.求证:
.
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名校
【推荐2】如图,在
中,
,
分别垂直平分
和
,交
于
,
两点,
与
相交于点
.
的周长为
,求
的长;
(2)若
,求
的度数.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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(2)若
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