已知正方形
的边长为12,点E由点C开始沿边
运动,连接
,点G为
的中点,
绕点E顺时针旋转
得到
,连接
.过点G作
于点M.
中点时,
①依题意补全图形;
②求证:
;
③求
的度数及点F到直线
的距离;
(2)当点E运动到B点时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa45d0cee608eb31c4b35d096bb5818.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①依题意补全图形;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b296fed937a2b4a98c29d40aca54cf25.png)
③求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a019aeda16984ccf31f7294c216a57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当点E运动到B点时,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
更新时间:2024-04-16 15:09:49
|
相似题推荐
解答题-证明题
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适中
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【推荐1】如图,四边形
是正方形,
,分别交对角线
于点
,
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2020/9/10/2546736126951424/2547751737393152/STEM/f9e95b6a23b74a4eb3f43a202af500b6.png?resizew=109)
(1)求证:四边形
是菱形:
(2)若
,
,求菱形
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b7af35a4b337ee57859c186abc0c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2020/9/10/2546736126951424/2547751737393152/STEM/f9e95b6a23b74a4eb3f43a202af500b6.png?resizew=109)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ff13b4da65c7da3d898ba58e967b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
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【推荐2】在
中,
,如图①,当
,
为
的角平分线时,在
上截取
,连接
,易证
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/81a6a596-1b87-4a4d-8a4b-ad395ff31bb9.png?resizew=461)
(1)如图②,当
,
为
的角平分线时,请直接写出你的猜想:
(2)如图③,当
为
的外角平分线时,线段
又有怎样的数量关系?请写出你的猜想,并对你的猜想给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60c04b3f2a65805d436c8faf6a1167f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824b78fd5c038cafd629ed02675c3053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a59395d1cf2530bed44ecac66699e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/81a6a596-1b87-4a4d-8a4b-ad395ff31bb9.png?resizew=461)
(1)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4d420ed89a5b9ccc1518eb3a595d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
(2)如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b91ffa59930d40f8bd246c048a7e6.png)
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【推荐1】如图,在
中,直径
平分弦
、
与
相交于点
,连接
、
,点
是
延长线上的一点,且
.
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447144195760128/2447749805932544/STEM/14ad13f4e95f4c5db10e8ead7681671c.png?resizew=139)
(1)求证:
是
的切线.
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ede1313321ebbf1a6308e35e9a3e1f.png)
![](https://img.xkw.com/dksih/QBM/2020/4/22/2447144195760128/2447749805932544/STEM/14ad13f4e95f4c5db10e8ead7681671c.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6665387cb2c8b9e4d4022ac9abae0d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图1,在平面直角坐标系中,点H在y轴上,
,点B在x轴的负半轴,点C在x轴的正半轴,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb59041a71ed82d70865bf63922eb0a.png)
(1)求点C的坐标;
(2)如图2,作点B关于直线CH的对称点A,连接AH,CA,若点D以每秒3个单位的速度从点B运动到点C,同时点E以每秒4个单位的速度从点C延射线CA运动,点D和点E一个运动停止,另一个也停止,连接HD,HE,设两点的运动时间为t,四边形HDCE的面积为S,用t表示S,并直接写出t的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a791da2c892787346863399f2254c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ffa4dec9c94773e75cb29f8cf5b2d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb262f3529a3e84959fe594b6628c77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb59041a71ed82d70865bf63922eb0a.png)
(1)求点C的坐标;
(2)如图2,作点B关于直线CH的对称点A,连接AH,CA,若点D以每秒3个单位的速度从点B运动到点C,同时点E以每秒4个单位的速度从点C延射线CA运动,点D和点E一个运动停止,另一个也停止,连接HD,HE,设两点的运动时间为t,四边形HDCE的面积为S,用t表示S,并直接写出t的取值范围
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/8496c080-72f6-4def-80e6-4774928814e6.png?resizew=390)
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【推荐1】在正方形ABCD中,E是CD上的点.若BE=30,CE=10,求正方形ABCD的面积和对角线长.
![](https://img.xkw.com/dksih/QBM/2019/1/28/2128388402176000/2131990080135168/STEM/ca83f6beaacf4475b94c629dac6b0e21.png?resizew=92)
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【推荐2】数学兴趣小组的同学发现:如果
,那么当∠1所对的直角边与另一直角边比值一定时,∠2所对的直角边与另一直角边也存在一定的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/ee4f280c-f58e-49b8-876c-91e353192634.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/b6d59726-2de1-4d18-8f71-dbd1e195f8be.png?resizew=204)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/2461fcc4-f2a4-4342-9948-3ee2b097e8a9.png?resizew=255)
(1)尝试:①如图1,在等腰直角△ABC中,
,
,点F是BC的中点,DF⊥AB于点D,连接AF,则
______,
______;
②如图2,在正方形ABCD中,
,点E为BC中点,
,求
的值;
(2)推理:如图2,在正方形ABCD中,
,保留②中其他条件不变,
的值;
(3)运用:如图3,在矩形ABCD的CD边上取一点E,将△BCE沿BE翻折,使点C恰好落在AD边上的点F处,延长EF,与∠ABF的角平分线交于点G,BG交AD于点H.当
,
,
时,求BG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844c9a2a4aa10c911ca537c3296a2ebe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/ee4f280c-f58e-49b8-876c-91e353192634.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/b6d59726-2de1-4d18-8f71-dbd1e195f8be.png?resizew=204)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/2461fcc4-f2a4-4342-9948-3ee2b097e8a9.png?resizew=255)
(1)尝试:①如图1,在等腰直角△ABC中,
![](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/67ec4d2f4fb216af05aff9f2880cc87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14acce7cdf2242d87518f9e52d02c7c9.png)
②如图2,在正方形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8caa10215ec02aae974558298180c9a4.png)
(2)推理:如图2,在正方形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8caa10215ec02aae974558298180c9a4.png)
(3)运用:如图3,在矩形ABCD的CD边上取一点E,将△BCE沿BE翻折,使点C恰好落在AD边上的点F处,延长EF,与∠ABF的角平分线交于点G,BG交AD于点H.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cfeb35addf27f2379a8e5f87c9b952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1fd72e2aead20db81dc1b9a193ebab.png)
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【推荐1】如图,四边形
是正方形,将
绕点A顺时针旋转一定角度后得到
,且点
在线段
上;已知
,
,求
的长和
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc232acd89fc499de346969ce8ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c644552971b3cd35d40ae732407baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359bc7a47c723102813220ef7283177.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/3ce21bb0-662d-4f0b-b34b-7e0cd074424a.png?resizew=215)
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【推荐2】(1)如图:已知D为等腰直角△ABC斜边BC上的一个动点(D与B、C均不重合),连结AD,△ADE是等腰直角三角形,DE为斜边,连结CE,求∠ECD的度数.
![](https://img.xkw.com/dksih/QBM/2019/10/4/2304613848596480/2305168225419264/STEM/1166d77494b04e0585af5f4d2ba4e0f9.png?resizew=400)
(2)当(1)中△ABC、△ADE都改为等边三角形,D点为△ABC中BC边上的一个动点(D与B、C均不重合),当点D运动到什么位置时,△DCE的周长最小?请探求点D的位置,试说明理由,并求出此时∠EDC的度数.
(3)在(2)的条件下,当点D运动到使△DCE的周长最小时,点M是此时射线AD上的一个动点,以CM为边,在直线CM的下方画等边三角形CMN,若△ABC的边长为4,请直接写出DN长度的最小值.
![](https://img.xkw.com/dksih/QBM/2019/10/4/2304613848596480/2305168225419264/STEM/1166d77494b04e0585af5f4d2ba4e0f9.png?resizew=400)
(2)当(1)中△ABC、△ADE都改为等边三角形,D点为△ABC中BC边上的一个动点(D与B、C均不重合),当点D运动到什么位置时,△DCE的周长最小?请探求点D的位置,试说明理由,并求出此时∠EDC的度数.
(3)在(2)的条件下,当点D运动到使△DCE的周长最小时,点M是此时射线AD上的一个动点,以CM为边,在直线CM的下方画等边三角形CMN,若△ABC的边长为4,请直接写出DN长度的最小值.
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【推荐3】综合与实践:
【问题情景】
综合与实践课上,王老师让同学们以“共顶点的等腰三角形的旋转”为主题开展数学探究活动.
【实践操作】
王老师让同学们先画出两个等边
和
,将
绕点
旋转到某一位置,要求同学们观察图形,提出问题并加以解决.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/f3bfb194-e759-4e0d-a745-e5e6e2f38b30.png?resizew=583)
(1)如图①,“慎思组”的同学们连接
、
,则
与
有何数量关系?
与
有何数量关系?请你探究后直接写出结论.
(2)如图②,得知“慎思组”的结论后,“博学组”的同学们又连接
,他们认为,如果
,且
,
,就可以求出
的长,请写出求解过程.
【类比探究】
(3)如图③,“智慧组”的同学们画出了两个等腰直角三角形
和
,其中
,
,
;且点
恰好落在
上,那么
、
和
之间一定存在某种数量关系,请你探究后直接写出它们之间的数量关系.
【问题情景】
综合与实践课上,王老师让同学们以“共顶点的等腰三角形的旋转”为主题开展数学探究活动.
【实践操作】
王老师让同学们先画出两个等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/f3bfb194-e759-4e0d-a745-e5e6e2f38b30.png?resizew=583)
(1)如图①,“慎思组”的同学们连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)如图②,得知“慎思组”的结论后,“博学组”的同学们又连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【类比探究】
(3)如图③,“智慧组”的同学们画出了两个等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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