阅读与思考
阅读下列材料并完成相应的任务.
(1)填空:材料中的依据是指______;
(2)将方法二的证明过程补充完整;
(3)如图4,在五边形
中,
,
.若点
分别是边
的中点,则线段
长的取值范围是______.
阅读下列材料并完成相应的任务.
四边形的中位线 我们学习过三角形的中位线,类似的,把连接四边形对边中点的线段叫做四边形的中位线.如图1,在四边形![]() ![]() ![]() ![]() ![]() ![]() 方法一:如图2,连接 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 同理: ![]() ![]() ![]() 在 ![]() ![]() 即 ![]() 方法二:如图3,连接 ![]() ![]() ![]() ![]() … |
(1)填空:材料中的依据是指______;
(2)将方法二的证明过程补充完整;
(3)如图4,在五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82054f4810285ab401d881290e611764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3956369191d0383bdb8786134da7dd9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
2024·山西太原·一模 查看更多[1]
更新时间:2024-04-20 11:38:39
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相似题推荐
解答题-问答题
|
适中
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【推荐1】在正方形
中,
绕点A顺时针旋转,它的两边分别交
、
(或它们的延长线)于点
.
(1)如果
在如图1所示的位置时,写出线段
之间的数量关系,并证明你的结论.
(2)请问当
绕点A旋转到如图2所示的位置时,线段
和
之间又有怎样的数量关系?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2a882372eed95410391e06a1da7046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/89b8c951-e183-4479-8ff7-6dc38d2d2c84.png?resizew=282)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29abbd467e24a5e949c42485ad1e3ab9.png)
(2)请问当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7decb1c197f855d08f2f9078b34d047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,已知△ACB和△ECD都是等腰直角三角形,A,C,D三点在同一直线上,连接BD,AE,延长AE交BD于点F,请说出AE与BD的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2017/11/20/1821193438093312/1821712733478912/STEM/ce71961446bc47269e4417917fc329bc.png?resizew=186)
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【推荐3】(1)如图1,锐角△ABC中,分别以AB、AC为边向外作等边△ABE和等边△ACD,连接BD,CE,直接写出一对全等三角形:____________________
试猜想BD与CE的大小关系,直接写出结论:________________________
【深入探究】
(2)如图2,△ABC中,∠ABC=45°,AB=10cm,BC=6cm,分别以AB、AC为边向外作正方形ABNE和正方形ACMD,连接BD,求BD的长.
(3)如图3,在(2)的条件下,以AC为直角边在线段AC的左侧作等腰直角△ACD,直接写出BD的长是_________________________.
试猜想BD与CE的大小关系,直接写出结论:________________________
【深入探究】
(2)如图2,△ABC中,∠ABC=45°,AB=10cm,BC=6cm,分别以AB、AC为边向外作正方形ABNE和正方形ACMD,连接BD,求BD的长.
(3)如图3,在(2)的条件下,以AC为直角边在线段AC的左侧作等腰直角△ACD,直接写出BD的长是_________________________.
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【推荐1】如图,
中,
,以
为直径作半圆
交
于点D,点E为
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/4e33287f-9ec7-4fec-b831-3c1fcba8d70e.png?resizew=173)
(1)求证:
是半圆
的切线;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e7c8586eef5596aef5fb5160a196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d2c58de1f94dfd30bbabe4421a3c40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/4e33287f-9ec7-4fec-b831-3c1fcba8d70e.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2895b12893aad40d1b48b06b41b8671c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
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【推荐2】如图,在Rt△ABC中,∠C=90°,∠A=15°.
![](https://img.xkw.com/dksih/QBM/2019/11/24/2340666267418624/2342725162459136/STEM/5a37fad6e5f042c3b45e4f31ebeff782.png?resizew=175)
(1)在AC边上求作点D,使得DA=DB.(尺规作图,不写作法,保留作图痕迹).
(2)在(1)的基础上,连接BD,若BC=1,则S△ABD= .
![](https://img.xkw.com/dksih/QBM/2019/11/24/2340666267418624/2342725162459136/STEM/5a37fad6e5f042c3b45e4f31ebeff782.png?resizew=175)
(1)在AC边上求作点D,使得DA=DB.(尺规作图,不写作法,保留作图痕迹).
(2)在(1)的基础上,连接BD,若BC=1,则S△ABD= .
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【推荐1】如图,在
中,
,D是
边上的中点,连接
平分
交
于点E.
交
于点F,求证:
.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0032f850bd19a3af6c44c416b0a2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc53b7f2b69c4e3b7d23c10a51c9bf2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9666188e21ea5c4b24d5248e87dc7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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【推荐2】如图,在
中,
,
为
边上的中线,
于点E.
![](https://img.xkw.com/dksih/QBM/2022/11/21/3114491446583296/3138408169701376/STEM/9d19757eb39f48f1a19871deb8a74933.png?resizew=141)
(1)求证:
;
(2)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](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/32c38dfd14dde969702dff97ef2270f9.png)
![](https://img.xkw.com/dksih/QBM/2022/11/21/3114491446583296/3138408169701376/STEM/9d19757eb39f48f1a19871deb8a74933.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b44f9d923d5c594c179b99197ae7810.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f732fce92dd33b28a254c2b1ae2261e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b8a4b0e72a4de1da975168b243a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解题方法
【推荐3】在平面直角坐标系
中,直线
为一、三象限角平分线,点
关于
轴的对称点称为
的一次反射点,记作
;
关于直线
的对称点称为点
的二次反射点,记作
.
例如,点
的一次反射点为
,二次反射点为
.
根据定义,回答下列问题:
(1)点
的一次反射点为__________,二次反射点为____________;
(2)当点
在第一象限时,点
,
,
中可以是点
的二次反射点的是___________;
(3)若点
在第二象限,点
,
分别是点
的一次、二次反射点,
为等边三角形,求射线
与
轴所夹锐角的度数.
(4)若点
在
轴左侧,点
,
分别是点
的一次、二次反射点,
是等腰直角三角形,请直接写出点
在平面直角坐标系
中的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
例如,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1245058626b9b4ff471247b02502c4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48a644e1135f4ddcd2fe1a345769812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bddec2bd3b91ffb4edb0b4600644224d.png)
根据定义,回答下列问题:
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48a644e1135f4ddcd2fe1a345769812.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543d7c6ecbd812e056af069868e97c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1741d51b23d9320ab3b3e672fe1d489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5db6cfb46a80e5eb8dbfc1eac8c2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabaab185c985f211f5aeda134240c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(4)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bab423cc92789c986ee2100176267e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/40483903-6a5c-42c2-a93b-3f491d2e72bf.png?resizew=208)
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【推荐1】如图,在
中,AB=BC,D、E、F分别是BC、AC、AB边上的中点.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492428686106624/2493848179859456/STEM/d9e68f54-0066-4c66-a22a-9f44882c4c64.png?resizew=232)
(1)求证:四边形
是菱形.
(2)若
求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492428686106624/2493848179859456/STEM/d9e68f54-0066-4c66-a22a-9f44882c4c64.png?resizew=232)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cae80c28b33bc231a64c8fa19a740e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
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【推荐2】如图,
是
的直径,点
、
是
上的点,且
,
分别与
、
相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/c205597d-bf9e-4f18-ac93-9abb3434c827.png?resizew=211)
(1)求证:点
为
的中点;
(2)若
,
,求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9672cc271c7f79973c34a1e179782762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/c205597d-bf9e-4f18-ac93-9abb3434c827.png?resizew=211)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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(0.65)
【推荐3】综合与实践
莹莹复习教材时,提前准备了一个等腰三角形纸片
,如图,
,
.为了找到重心,以便像教材上那样稳稳用笔尖顶起,她先把点B与点C重叠对折,得折痕
,展开后,她把点B与点A重叠对折,得折痕
,再展开后连接
,交折痕
于点O,则点O就是
的重心.
(1)初步观察:连接
,则
与
的数量关系是:________;
(2)初步探究:请帮助莹莹求出
的面积;
(3)猜想验证:莹莹通过测量惊奇地发现
,
.她的发现正确吗?请说明理由.
莹莹复习教材时,提前准备了一个等腰三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
如图,用铅笔可以支起一张均匀的三角形卡片.你知道怎样确定这个点的位置吗?![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)初步探究:请帮助莹莹求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)猜想验证:莹莹通过测量惊奇地发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321231b7c9c2902f953d47f0137bb823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11995c96da35c9a923c86385e5a572ee.png)
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