如图1,ABCD为正方形,直线MN分别过AD边与BC边的中点,点P为直线MN上任意一点,连接PB、PC分别与AD边交于E、F两点,PC与BD交于点K,连接AK与PB交于点G.
![](https://img.xkw.com/dksih/QBM/2019/1/4/2111711318999040/2113439215820800/STEM/440de84954d34df2b982d164f61aa82d.png?resizew=388)
(1)探索发现
当点P落在AD边上时,如图2,试探究PB与AK的位置关系以及PB、PK、AK三者的数量关系(直接写出无需证明);
(2)延伸拓展
当点P落在正方形外,如图1,以上两个结论是否仍然成立?如果成立请给出证明,如果不成立请说明你的理由;
(3)应用推广
如图3,在等腰Rt△ABD中,其中∠BAD=90°,腰长为3,M、N分别为AD边与BD边的中点,K为线段DN中点,F为AD边上靠近于D的三等分点.连接KF并延长与直线MN交于点P,连接PB分别与AD、AK交于点E、G.试求四边形EFKG的周长及面积.
![](https://img.xkw.com/dksih/QBM/2019/1/4/2111711318999040/2113439215820800/STEM/440de84954d34df2b982d164f61aa82d.png?resizew=388)
(1)探索发现
当点P落在AD边上时,如图2,试探究PB与AK的位置关系以及PB、PK、AK三者的数量关系(直接写出无需证明);
(2)延伸拓展
当点P落在正方形外,如图1,以上两个结论是否仍然成立?如果成立请给出证明,如果不成立请说明你的理由;
(3)应用推广
如图3,在等腰Rt△ABD中,其中∠BAD=90°,腰长为3,M、N分别为AD边与BD边的中点,K为线段DN中点,F为AD边上靠近于D的三等分点.连接KF并延长与直线MN交于点P,连接PB分别与AD、AK交于点E、G.试求四边形EFKG的周长及面积.
更新时间:2019-01-07 09:06:00
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相似题推荐
解答题-证明题
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【推荐1】如图1,
为等边三角形,在AB、AC上分别取点E、D,使
,连接DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/db4f3fbe-8adc-4b19-94f3-779443548993.png?resizew=455)
(1)求证:
是等边三角形.
(2)点M、N分别是BE、CD的中点,连接MN,当
绕A点旋转到如图2的位置时,求
的度数.
(3)在(2)的条件下,若
,
,
,求AN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/db4f3fbe-8adc-4b19-94f3-779443548993.png?resizew=455)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)点M、N分别是BE、CD的中点,连接MN,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7098c45594103b46e6b57cfc6023e93.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6133decf8382f19fcccce11b1e74b238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209177a9ad66cbd98b451df005d5e9c6.png)
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【推荐2】已知:M是AB的中点,MC=MD,∠1=∠2,若AC=8 cm,求BD的长度.
![](https://img.xkw.com/dksih/QBM/2020/2/2/2390137679880192/2390503479599104/STEM/4eaf2446-15b1-437d-9260-551553ec9779.png?resizew=179)
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【推荐1】(1)如图1,在
中,
,
,
,D为
边上一点,
.求证:
平分
.
(2)如图2,矩形
中,
,
,点E是
边上一点,
,连接
,请用无刻度的直尺和圆规在
边上找一点F,使得
.(保留作图痕迹,不要求写出作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f39fdcf98775b0a4960d6bc870eddfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/c224ff07-2203-4544-a4a0-7e77f036af87.png?resizew=149)
(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ba9fd834b7872cc687bfb8756f6913.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/82e25737-fee7-4b74-bdda-eb4209af40b4.png?resizew=133)
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【推荐2】问题探究
将几何图形按照某种法则或规则变换成另一种几何图形的过程叫做几何变换.旋转变换是几何变换的一种基本模型.经过旋转,往往能使图形的几何性质明白显现.题设和结论中的元素由分散变为集中,相互之间的关系清楚明了,从而将求解问题灵活转化.
问题提出:如图1,
是边长为1的等边三角形,P为
内部一点,连接
、
、
,求
的最小值.
方法分析:通过转化,把由三角形内一点发出的三条线段(星型线)转化为两定点之间的折线(化星为折),再利用“两点之间线段最短”求最小值(化折为直).
问题解决:如图2,将
绕点
逆时针旋转
至
,连接
,记
与
交于点
,易知
.由
,可知
为正三角形,有
.
故
.因此,当
共线时,
有最小值是
.
学以致用:
(1)如图3,在
中,
为
内部一点,连接
,则
的最小值是________.
(2)如图4,在
中,
为
内部一点,连接
,求
的最小值.
将几何图形按照某种法则或规则变换成另一种几何图形的过程叫做几何变换.旋转变换是几何变换的一种基本模型.经过旋转,往往能使图形的几何性质明白显现.题设和结论中的元素由分散变为集中,相互之间的关系清楚明了,从而将求解问题灵活转化.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/7622130e-e51a-4cf4-8fbd-900f73b3ec98.png?resizew=668)
问题提出:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d587ad158907a19ce5c7527698cc88e9.png)
方法分析:通过转化,把由三角形内一点发出的三条线段(星型线)转化为两定点之间的折线(化星为折),再利用“两点之间线段最短”求最小值(化折为直).
问题解决:如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08b395fcd6ac97b243d81ffa189fac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5b70538a04aa8b90833ade21697d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1fc2be6f9dce009cfb6d86a805d72e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6c19b63c46dd572362f155b17abaf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cd18d6899c9557d67c602e2a80dc01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ccbe874f84d01483637204b44d8245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7962ca672dbe440498618642ba4cf5b0.png)
故
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf8bf59af703f18e03490bbcfdd436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d010504270e2626e6d7bd6ae1de6c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
学以致用:
(1)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4900afad6b7f273f707a8ef835673336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
(2)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06fe7474f9d6fc7f1d58ad510aae63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc5bcc08ecb2f523e44269146b1798.png)
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【推荐1】某班“手拉手”数学学习互助小组对矩形内两条互相垂直的线段与矩形两邻边的数量关系进行探究时,遇到以下问题,请你逐一加以解答:
(1)如图1,正方形ABCD中,EF⊥GH,EF分别交AB,CD于点E,F,GH分别交AD,BC于点G,H,则EF GH;(填“>”“=”或“<”)
(2)如图2,矩形ABCD中,EF⊥GH,EF分别交AB,CD于点E,F,GH分别交AD,BC于点G,H,求证:
=
;
(3)如图3,四边形ABCD中,∠ABC=∠ADC=90°,BC=3,CD=5,AD=7.5,AM⊥DN,点M,N分别在边BC,AB上,求
的值.
(1)如图1,正方形ABCD中,EF⊥GH,EF分别交AB,CD于点E,F,GH分别交AD,BC于点G,H,则EF GH;(填“>”“=”或“<”)
(2)如图2,矩形ABCD中,EF⊥GH,EF分别交AB,CD于点E,F,GH分别交AD,BC于点G,H,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d12504c6da5f94ba2656ca727c2fe82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
(3)如图3,四边形ABCD中,∠ABC=∠ADC=90°,BC=3,CD=5,AD=7.5,AM⊥DN,点M,N分别在边BC,AB上,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f710f8f1fa0df203765d18692ded6a91.png)
![](https://img.xkw.com/dksih/QBM/2020/3/10/2416450184650752/2416728262377472/STEM/1e115f847fac4f408d6c4713f2087261.png?resizew=383)
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【推荐2】如图1,正方形
边长为10,
为边
上一点,点
与点
关于直线
对称,直线
与
交于点
,连接
,
.
(1)求证:
是等腰三角形;
(2)求
的度数;
(3)如图2,若点
为
中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/72e80e86-2d27-4b43-88fc-5bd57ba480f4.png?resizew=423)
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解答题-证明题
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【推荐1】如图,
是正方形
的对角线,
平分
交
于点E,点M在
上,且
,连接
并延长,分别交
,
于点G,F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/9bb70bbe-ba39-4f7c-bf13-7304ab2ee6ae.png?resizew=169)
(1)求证:
;
(2)求证:
;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c780c8f43ce63266571994c756e6b0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/9bb70bbe-ba39-4f7c-bf13-7304ab2ee6ae.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569b3d6a23459e586ead541d8c63d636.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beffcba06042208e8f5bdd0b611313f2.png)
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【推荐2】已知:如图,在△ABC中,∠ABC=2∠C.
(1)作∠ABC的平分线BD,交AC于点D.(尺规作图,保留作图痕迹,不写作法)
(2)在(1)的条件下,求证:AB·BC=AC·CD.
(1)作∠ABC的平分线BD,交AC于点D.(尺规作图,保留作图痕迹,不写作法)
(2)在(1)的条件下,求证:AB·BC=AC·CD.
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631139902709760/2633091864674304/STEM/2238299d02914034835e8a6e5cc1d177.png?resizew=233)
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