如图,
是等边三角形,点D是边
上的一点,过点A作
于点H,以
为边在
右侧作等边
交
于点F,
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898390307143680/2956773990694912/STEM/2ddbf43b-34ab-4cd3-a579-f9d1443a07a2.png?resizew=170)
(1)求
的度数.
(2)求证:点F是
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc16a9467a6de4ff5cfccc4316ae871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e783e2d0e69e24603fa5eb3d8040586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898390307143680/2956773990694912/STEM/2ddbf43b-34ab-4cd3-a579-f9d1443a07a2.png?resizew=170)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53a92b465cdbfa308a8bd5e35d2bd27.png)
(2)求证:点F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
更新时间:2022-04-12 21:14:59
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知AB//CD,∠B=64°,CM平分∠BCE,∠MCN=90°.求∠DCN的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/76a29f4b-5e1d-4f4e-85f5-7f56fcaf7a5d.png?resizew=157)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】(1)观察理解:如图1,
中,
,
,直线
过点
,点
,
在直线
同侧,
,
,垂足分别为
,
,由此可得:
,所以
,又因为
,所以
,所以
,又因为
,所以
( );(请填写全等判定的方法)
(2)理解应用:如图2,
,且
,
,且
,利用(1)中的结论,请按照图中所标注的数据计算图中实线所围成的图形的面积
;
(3)类比探究:如图3,
中,
,
,将斜边
绕点
逆时针旋转
至
,连接
,求△
的面积.
(4)拓展提升:如图4,等边
中,
,点
在
上,且
,动点
从点
沿射线
以
速度运动,连接
,将线段
绕点
逆时针旋转
得到线段
.设点
运动的时间为
秒.
①当
秒时,
;
②当
秒时,
;
③当
秒时,点
恰好落在射线
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e77a906a317863df81327e97ae0d5e4.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/a3f0ca8685431a5114a4b9288e6f93bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2b6f11b74b1cb04d9ed8fe485687e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfc52a6655c83c8c7eb081bd0f26e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e72d812fdaca589976ea299cc7468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb8ea50bada11e6bf218e0de63bf515.png)
(2)理解应用:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
(3)类比探究:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdfb59c34fca7218f73821e5c31d1df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3568dd80dbfabbd56643668dc4b764.png)
(4)拓展提升:如图4,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516eab2f2b97c8f2931321e285ffabb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be25dd5a289b24fa89d9939ef0ff864f.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/4b6485afddd0b6fe46abc1d0a3268b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b561e63043cd4c4e2e295d817e83ac0.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,在▱ABCD中,点E,点F分别是AD,BC的中点,连接BE,DF.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746477092864/3058291221127168/STEM/9a44b1f6ba6c4734bc322a2ae77bcb6d.png?resizew=200)
(1)求证:△ABE≌△CDF;
(2)若BE平分∠ABC,AB=3,求平行四边形ABCD的周长.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746477092864/3058291221127168/STEM/9a44b1f6ba6c4734bc322a2ae77bcb6d.png?resizew=200)
(1)求证:△ABE≌△CDF;
(2)若BE平分∠ABC,AB=3,求平行四边形ABCD的周长.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,
是等边三角形
内一点,将线段绕点
顺时针旋转
得到线段
,连结
,
.
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322426596671488/2322642300215296/STEM/1676cba3498e4ba0b226c9da9fddede8.png?resizew=136)
(1)求证:
;
(2)连接
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322426596671488/2322642300215296/STEM/1676cba3498e4ba0b226c9da9fddede8.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591cb1d6d2fa2f4d438364a5fc52bbd9.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57061067900de760e24ce22e51d8b1c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,已知点M是
的中点,
是过点M的一条直线,且
,垂足分别为点E,F.
;
(2)猜想
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb9aba440735000b3bdfc9cf3b79da1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c0fa2542f8508f977a5b9eca07b876.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐2】已知,在Rt△ABC中,∠ACB=90°,D是BC边上一点,连接AD,分别以CD和AD为直角边作Rt△CDE和Rt△ADF,使∠DCE=∠ADF=90°,点E,F在BC下方,连接EF.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307603083206656/2307742197399552/STEM/0fda43ba5d284c149478897b3c924478.png?resizew=377)
(1)如图1,当BC=AC,CE=CD,DF=AD时,
求证:①∠CAD=∠CDF,
②BD=EF;
(2)如图2,当BC=2AC,CE=2CD,DF=2AD时,猜想BD和EF之间的数量关系?并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/10/8/2307603083206656/2307742197399552/STEM/0fda43ba5d284c149478897b3c924478.png?resizew=377)
(1)如图1,当BC=AC,CE=CD,DF=AD时,
求证:①∠CAD=∠CDF,
②BD=EF;
(2)如图2,当BC=2AC,CE=2CD,DF=2AD时,猜想BD和EF之间的数量关系?并说明理由.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,
和
分别是等腰直角三角形和等边三角形,点
、
、
、
分别是
、
、
、
边上的中点,连接
、
、
、
.
,则
的长度是 .
(2)判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643eec729af3f5419c1b86cd03528a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在等边三角形
中,点E是边
上一动点(不与B,C重合),以
为边在
的下方作等边三角形
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/9a40465b-3211-4673-9bf5-25d27ae126e9.png?resizew=129)
(1)在运动的过程中,
与
有何数量关系?请说明理由.
(2)当E为
中点时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec3bb6ddaa0eaec19b4ced7343e040b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc6235b84cd02019125449f5958f73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/9a40465b-3211-4673-9bf5-25d27ae126e9.png?resizew=129)
(1)在运动的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)当E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
您最近一年使用:0次