如图,在
中,
,
,
是
的中点,
是线段
延长线上一点,过点
作
,与线段
的延长线交于点
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2023/6/14/3259685574885376/3260172832194560/STEM/b79ee62804aa45df91e7697df87b49fa.png?resizew=202)
(1)求证:
;
(2)若点
为
的中点,试判断四边形
是什么样的四边形?并证明你的结论;
(3)若
,求证四边形
是什么四边形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e64f1d9d1dfa1cb58eba4218745373a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2023/6/14/3259685574885376/3260172832194560/STEM/b79ee62804aa45df91e7697df87b49fa.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489527b3e4e6a6499b5006eb6c1ff37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
更新时间:2023-06-15 13:01:31
|
相似题推荐
解答题-证明题
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【推荐1】如图1,在Rt△ABC中,∠BAC=90°,AB=4,以AB为边在AB上方作等边△ABD,以BC为边在BC右侧作等边△CBE,连结DE.
(1)当AC=5时,求BE的长.
(2)求证:BD⊥DE.
(3)如图2,点C′与点C关于直线AD对称,连结C′E.
①求C′E的长.
②连结C′D,当△C′DE是以C′E为腰的等腰三角形时,写出所有满足条件的AC长: .(直接写出答案)
(1)当AC=5时,求BE的长.
(2)求证:BD⊥DE.
(3)如图2,点C′与点C关于直线AD对称,连结C′E.
①求C′E的长.
②连结C′D,当△C′DE是以C′E为腰的等腰三角形时,写出所有满足条件的AC长: .(直接写出答案)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/7ddc10d8-9ac6-4962-ac1e-7c9a86eb24a6.png?resizew=279)
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【推荐2】如图,点
是
上一点,
,且
交
于点
,作
,垂足为
,并交
于点
,连接
.
求证:
是
的切线;
过点
作
,交
的延长线于点
,连接
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ac747fa7e033b09ab20370fd27d5be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9002425889fb6b9a8c8d60578c9a81fa.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/464e16e3387532eb66521b4e97791cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c5e31fbc3c8e484125d421469e6085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18df54641f9144727776b2c0676a4a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/72a99f52-0af1-4b23-9733-f9a4b33743b7.png?resizew=196)
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【推荐1】问题情境
如图1,已知矩形ABCD中,点E,F是AD,BC的中点,连接EF,将矩形ABCD沿FF剪开,得到四边形ABFE和四边形EPCD.
(1)求证:四边形EPCD是矩形;
操作探究
保持矩形EPCD位置不变,将矩形ABFE从图1的位置开始,绕点E按逆时针方向旋转.设旋转角为α(O°<α<360°)操作中,提出了如下问题,请你解答.
(2)如图2,当矩形ABFE旋转到点A落在线段EP上时,线段EF恰好经过点D,设DC与AB相交于点G.判断四边形EAGD的形状,并说明理由.
(3)在矩形ABFE旋转过程中连接线段AP和BP,当AP=BP时,求旋转角α的度数.
如图1,已知矩形ABCD中,点E,F是AD,BC的中点,连接EF,将矩形ABCD沿FF剪开,得到四边形ABFE和四边形EPCD.
(1)求证:四边形EPCD是矩形;
操作探究
保持矩形EPCD位置不变,将矩形ABFE从图1的位置开始,绕点E按逆时针方向旋转.设旋转角为α(O°<α<360°)操作中,提出了如下问题,请你解答.
(2)如图2,当矩形ABFE旋转到点A落在线段EP上时,线段EF恰好经过点D,设DC与AB相交于点G.判断四边形EAGD的形状,并说明理由.
(3)在矩形ABFE旋转过程中连接线段AP和BP,当AP=BP时,求旋转角α的度数.
![](https://img.xkw.com/dksih/QBM/2019/6/26/2233792114343936/2235144881119232/STEM/0e808531ce9f45d2b642c501ec9c73fc.png?resizew=277)
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【推荐2】如图1,已知三角形纸片△ABC和△DEF重合在一起,AB=AC, DE=DF,△ABC≌△DEF.
⑴保持△ABC不动,将△DEF绕着BC的中点旋转180º,得到的四边形是 .(填平行四边形、菱形、矩形、正方形)
⑵将两个三角形按图2所示放置:点C与点F重合,AB∥DE,AB=13,BC=10,
①连接AD、BE,判断四边形ABED的形状并说明理由;
②求四边形ABED的面积
⑴保持△ABC不动,将△DEF绕着BC的中点旋转180º,得到的四边形是 .(填平行四边形、菱形、矩形、正方形)
⑵将两个三角形按图2所示放置:点C与点F重合,AB∥DE,AB=13,BC=10,
①连接AD、BE,判断四边形ABED的形状并说明理由;
②求四边形ABED的面积
![](https://img.xkw.com/dksih/QBM/2019/6/3/2217542074859520/2218186954522624/STEM/5a5edd83-2931-44c3-9bb4-8de5e09774da.png?resizew=274)
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【推荐1】如图,四边形
的两条对角线
交于点O,
,
.
;
①求证:
;
②点E在边
上,且
平分
,
,求证:四边形
为菱形;
(2)如图2,
与
的延长线交于点E,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ed1a7ab098b824f9c76b1145f30941.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
②点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)如图2,
![](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/6e5faed21b6b2af6a281de5d49da9ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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【推荐2】如图,在△ABC中,AE是∠BAC的平分线,与BC交于点E,D是边AC上一点,且AB=AD,DF
BC,与AE交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/3de47380-4849-4e94-b9ab-34a0b44c0ba6.png?resizew=171)
(1)求证:四边形BEDF是菱形;
(2)若D是AC的中点,当△DEC是直角三角形时,则
的值为_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/3de47380-4849-4e94-b9ab-34a0b44c0ba6.png?resizew=171)
(1)求证:四边形BEDF是菱形;
(2)若D是AC的中点,当△DEC是直角三角形时,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f276ad76c075f4be32ad326d223cf3.png)
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【推荐3】综合与实践
问题情境:“综合与实践”课上,老师提出如下问题:有两个全等的三角形纸片
和
,其中
,将
和
按图1所示方式摆放,斜边
和
的中点重合(标记为点
),
交
于点
.当
时,试判断四边形
的形状,并说明理由.
数学思考:(1)请你解答老师提出的问题;
深入探究:(2)老师将图1中的
绕点
逆时针方向旋转,使点
落在直线
上方,并让同学们提出新的问题.
①“善思小组”提出问题:如图2,当
时,
分别交
于点
,
分别交
于点
交
于点
.试猜想线段
和
的数量关系,并加以证明.请你解答此问题;
②“智慧小组”提出问题:在①的条件下,若
,求两个三角形重叠部分六边形
的面积.请你思考此问题,直接写出结果.
问题情境:“综合与实践”课上,老师提出如下问题:有两个全等的三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39dfe9be81c5e7acb87d298e363907cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cad97dd9d9593fa01342550aba6ec47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5a2ae06a721434453e85c287be68f7.png)
数学思考:(1)请你解答老师提出的问题;
深入探究:(2)老师将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①“善思小组”提出问题:如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ed1977dc05b3d493bbd56689e8f8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a2ec080b51ac9c53c1ebba0a8b64be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764cebbcc289f3c9b3ffec30efeafe67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
②“智慧小组”提出问题:在①的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665fefc7bcf763c49b605982f1bdba49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ddbf1880ccbc0aee3eba1814c61f11.png)
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