如图,
为等边三角形,点D为
边上一点,先将三角板
角的顶点与D点重合,平放三角板,再绕点D转动三角板,三角板
角的两边分别与边
、
交于点E、点F,当
时,如图(2)所示.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e975471569b682753c4126a26cabf91.png)
![](https://img.xkw.com/dksih/QBM/2023/5/7/3232524099198976/3254120752414720/STEM/8a6ec3d7b5704d0ca21cb325f72c2238.png?resizew=322)
22-23八年级下·广东深圳·期中 查看更多[5]
广东省深圳市宝安区松岗中学等六校2022-2023学年八年级下学期期中数学试卷 广东省深圳市罗湖区2022-2023学年八年级下学期期中数学试卷(已下线)专题08 全等三角形证明方法 一线三等角模型【考点串讲+热点题型专训】-2022-2023学年七年级数学下学期期中期末考点大串讲(北师大版)(已下线)第11讲 等边三角形的性质与判定定理-【暑假自学课】2023年新八年级数学暑假精品课(浙教版)广东省深圳市龙岗区南芳学校2022-2023学年八年级下学期期中数学试题
更新时间:2023-06-06 23:48:31
|
相似题推荐
填空题
|
较易
(0.85)
【推荐1】如图,将△ABC绕点C顺时针旋转至△DEC,使点D落在BC的延长线上,已知∠A=26°,∠B=40°,则∠ACE=_________ .
![](https://img.xkw.com/dksih/QBM/2022/6/6/2995621404778496/2997595915010048/STEM/9cd9acae-283a-4e6f-ba3e-807a8547f0ed.png?resizew=258)
您最近一年使用:0次
填空题
|
较易
(0.85)
【推荐2】①如图,是一张很有用的图,你知道∠BOC=∠1+∠2+∠3的奥秘吗?请用你学过的知识予以证明.(可自主添加必要的辅助线)
![](https://img.xkw.com/dksih/QBM/2015/6/11/1573846654074880/1573846660530176/STEM/d2ca56f1d751473fbcafa33f87818c90.png?resizew=108)
②如图,设x=∠A+∠B+∠C+∠D+∠E.运用①的结论填空:![](https://img.xkw.com/dksih/QBM/2015/6/11/1573846654074880/1573846660530176/STEM/8b815eb40a3a4ab38717b4732c8a4d31.png?resizew=437)
________
;
________
;
________
.
![](https://img.xkw.com/dksih/QBM/2015/6/11/1573846654074880/1573846660530176/STEM/d2ca56f1d751473fbcafa33f87818c90.png?resizew=108)
②如图,设x=∠A+∠B+∠C+∠D+∠E.运用①的结论填空:
![](https://img.xkw.com/dksih/QBM/2015/6/11/1573846654074880/1573846660530176/STEM/8b815eb40a3a4ab38717b4732c8a4d31.png?resizew=437)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
您最近一年使用:0次
填空题
|
较易
(0.85)
【推荐1】如图,已知正方形
中,
,
. 点
是射线
上一动点(点
不与点
重合),在
右侧作
, 且
,连接
,则
的度数为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fde4cd44422170d32f7d963d5014ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bf2ee47dda2f39a856411c7d3f279a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f756feaa4007b743ca120a14fbdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bf2ee47dda2f39a856411c7d3f279a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cdb42bac73b83b00ff363db650c16e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccbec020bd12190461bf6c9d06d3b6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9235429cc1a04df49df50f95c0f2f554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a019aeda16984ccf31f7294c216a57c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/abe40ebd-3ee0-46db-9d76-8cbb7e7a40c8.png?resizew=200)
您最近一年使用:0次
填空题
|
较易
(0.85)
【推荐2】如图,在
中,
为对角线,
,
,垂足分别为点
,
.若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f79997547fb75e88ad1e2c66989a4a0.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.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/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f79997547fb75e88ad1e2c66989a4a0.png)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759739221073920/2802847383289856/STEM/f2e2c47c-8c57-4451-aa8b-cfbdf93d68e0.png)
您最近一年使用:0次
填空题
|
较易
(0.85)
真题
【推荐1】边长为6cm的等边三角形中,其一边上高的长度为__ .
您最近一年使用:0次
填空题
|
较易
(0.85)
【推荐2】如图,
是等边三角形,
平分
,点
在
的延长线上,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5b3967aa677f18e92912d2397f4907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/1/72929d83-db5c-42f4-bf31-66e34ddca2e9.png?resizew=189)
您最近一年使用:0次