如图1,正方形
的边长为1,
为边
上一点(不与点
、
重合),垂直于
的一条直线
分别交
、
、
于点
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/08d72295-5e68-4e4c-acfb-8fb9f89c5dbd.png?resizew=161)
(1)①求证:
;
②连接
、
、
,直接写出 四边形
的面积S的取值范围.
(2)如图2,若垂足
为
的中点,连接
,交
于点
,连接
,求
的度数.
(3)如图3,当垂足
在正方形
的对角线
上时,作
,垂足为
,点
在边
上运动过程中,
的长度是否变化?若不变,求出
的长;若变化,说明变化规律.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/62c988c4-55b9-4509-aa2c-39c860e35311.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/2d0d213f-d6ba-4607-92b7-bff831a4fcbd.png?resizew=161)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/08d72295-5e68-4e4c-acfb-8fb9f89c5dbd.png?resizew=161)
(1)①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab6eddbb3c5121b7a4c323f7d216d7b.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213c82fa2074e9366a3b9dbe63ff7890.png)
(2)如图2,若垂足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
(3)如图3,当垂足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d64fc6518f35afde5849946ca4c8d12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
更新时间:2022-09-05 21:51:38
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】已知:∠MON=45°,点A在OM上,点B、C在ON上,且OB>OA,
(1)如图1,当点C在点B的右侧时,在ON下方作∠NCD=45°,交AB的延长线于点D.
①若AB=BD,请直接写出线段OA和CD的关系 ;
②若AB=
BD,判断线段OA和CD的关系,并说明理由;
③若AB=10,BD=8,OB=14,则CD= ;
(2)如图2,当点C在点B的左侧时,在ON下方作∠NCD=45°,CD的反向延长线交AB于点A,在∠OAB的内部作∠BAE=45°,交ON于点E,则线段OE、EB、CB之间的数量关系是 .
(1)如图1,当点C在点B的右侧时,在ON下方作∠NCD=45°,交AB的延长线于点D.
①若AB=BD,请直接写出线段OA和CD的关系 ;
②若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
③若AB=10,BD=8,OB=14,则CD= ;
(2)如图2,当点C在点B的左侧时,在ON下方作∠NCD=45°,CD的反向延长线交AB于点A,在∠OAB的内部作∠BAE=45°,交ON于点E,则线段OE、EB、CB之间的数量关系是 .
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449976296341504/2451212110905344/STEM/9382cd8d4df34cf09f6ec9eda3dd86d7.png?resizew=383)
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【推荐2】问题提出;
(1)如图1,长方形
,
,
,点
为
的中点,点
为
上的动点,
时,
的周长最小;
(2)如图2,长方形
,
,
,点
为
的中点,点
、点
为
上的动点,且
,当四边形
的周长最小时,请确定点
的位置;(即求
的长)
问题解决;
(3)如图3,某公园计划在一片足够大的等边三角形水域内部(不包括边界)点
处修一个凉亭,设计要求
长为10米,同时点
,
分别是水域
,
边上的动点,连接
、
、
的水上浮桥周长最小时,四边形
的面积最大,请你帮忙算算此时四边形
面积的最大值是多少?
(1)如图1,长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc2ddabf078c1b683b067eb1aee1969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
(2)如图2,长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d14c6959273338a048b023805cce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b901190ec1f945c0e8d69b203ca153b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
问题解决;
(3)如图3,某公园计划在一片足够大的等边三角形水域内部(不包括边界)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e6f84f2a5721303019f158d860cd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e6f84f2a5721303019f158d860cd5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/59e06b61-8aaf-45fa-af35-4fe36f1e7bee.png?resizew=489)
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解答题-证明题
|
困难
(0.15)
名校
【推荐1】在
ABC中,∠B=45°,∠C=30°,点D是BC上一点,连接AD,将线段AD绕点A逆时针旋转90°,得到线段AE,连接DE.
(1)如图①,当点E落在边BA的延长线上时,∠EDC= 度(直接填空);
(2)如图②,当点E落在边AC上时,求证:BD=
EC;
(3)当AB=2
,且点E到AC的距离EH=
﹣1时,直接写出AH的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图①,当点E落在边BA的延长线上时,∠EDC= 度(直接填空);
(2)如图②,当点E落在边AC上时,求证:BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)当AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695931847024640/2701706631839744/STEM/76a754b5baac4788bad32a1a6ef32d9c.png?resizew=489)
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【推荐2】如图,四边形ABCD为正方形,O为正方形ABCD对角线的交点,M是CA延长线上的一个动点(点M与点C、A都不重合),过点A、C分别向直线BM作垂线段,垂足分别为E,F,连接OE.
(1)若
,求证:
;
(2)用等式直接写出线段CF,AE,OE之间的数量关系,并证明.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4714e33baa77ada39336c475a4be1cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d088ec0c76fe3c152bf3dd7dadf42cba.png)
(2)用等式直接写出线段CF,AE,OE之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/2020/2/10/2396214354395136/2396557726203904/STEM/fe87af0ca5f8440e9344765fe4da2198.png?resizew=155)
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解答题-问答题
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困难
(0.15)
名校
【推荐1】在平面直角坐标系中,O为坐标原点,直线y=x+b交x轴的负半轴于点A,交y轴的正半轴于点B,AB=6
,点C在x轴的正半轴上,OC=2.
(1)如图1,求直线BC的解析式;
(2)如图2,点D在第四象限的直线C上,DE⊥AB于点E,DE=AB,求点D的坐标;
(3)在(2)的条件下,请在平面内找一点P,使得四边形PDBE是平行四边形,直接写出这样的点P的坐标;
(4)如图3,在(2)的条件下,点F在线段OA上,点G在线段OB上,射线FG交直线BC于点H,若∠FGO=2∠AEF,FG=5,求点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)如图1,求直线BC的解析式;
(2)如图2,点D在第四象限的直线C上,DE⊥AB于点E,DE=AB,求点D的坐标;
(3)在(2)的条件下,请在平面内找一点P,使得四边形PDBE是平行四边形,直接写出这样的点P的坐标;
(4)如图3,在(2)的条件下,点F在线段OA上,点G在线段OB上,射线FG交直线BC于点H,若∠FGO=2∠AEF,FG=5,求点H的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/d3adbac0-0092-498e-8a54-844a3f05e972.png?resizew=484)
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解答题-证明题
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名校
【推荐2】如图,在
中,
,
,
,点P从A出发,沿
方向以每秒1个单位长度的速度向终点C运动.当点P不与点A、C重合时,将线段
绕点P逆时针旋转
,得到线段
,以
为边作矩形
.点H恰好落在直线
上,设矩形
与
重叠部分的图形面积为S(平方单位),点P的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/84a485dc-1fc1-410f-85a5-af4029828487.png?resizew=164)
(1)证明矩形
的周长是一个定值.
(2)当矩形
为正方形时,求t的值.
(3)在整个运动过程中,存在全等三角形时,求S的值.
(4)矩形
的对角线
和
的交点为M,作点Q关于直线
的对称点N,当
与
的边平行或者垂直时,直接写出此时的t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b343d129b6c503de764f3dcd96eda9fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb98981c09e13c72e6562da53d304eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb98981c09e13c72e6562da53d304eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/84a485dc-1fc1-410f-85a5-af4029828487.png?resizew=164)
(1)证明矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb98981c09e13c72e6562da53d304eee.png)
(2)当矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb98981c09e13c72e6562da53d304eee.png)
(3)在整个运动过程中,存在全等三角形时,求S的值.
(4)矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb98981c09e13c72e6562da53d304eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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困难
(0.15)
【推荐3】【阅读材料】如图1所示,对于平面内
,在
上有弦
,取弦
的中点
,我们把弦
的中点
到某点或某直线的距离叫做弦
到这点或者这条直线的“密距”.例如:图1中线段
的长度即为弦
到原点
的“密距”.过点
作
轴的垂线交
轴于点
,线段
的长度即为弦
到
轴的“密距”.
【类比应用】已知
的圆心为
,半径为4,弦
的长度为4,弦
的中点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c225ba67-0f85-4f1e-b623-929601e04a63.jpg?resizew=494)
(1)当
轴时,如图2所示,圆心
到弦
的中点
的距离是______,此时弦
到原点
的“密距”是______.
(2)①如果弦
在
上运动,在运动过程中,圆心
到弦
的中点
的距离变化吗?若不变化,请求出
的长,若变化,请说明理由.
②直接写出弦
到原点的“密距”d的取值范围______;
(3)【拓展应用】如图3所示,已知
的圆心为
,半径为4,点
,点
为
上的一动点,弦
到直线
的“密距”的最大值是______(直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
【类比应用】已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bd80753a2f1733ad6b0977802f39b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c225ba67-0f85-4f1e-b623-929601e04a63.jpg?resizew=494)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f614a3aa0923fbbc1069de0e1d911a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)①如果弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
②直接写出弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)【拓展应用】如图3所示,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bd80753a2f1733ad6b0977802f39b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622d475f7785b71633f058e6da3c7d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d4e84765a90cf065a696a6af061c3b.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】如图1,已知正方形
中,
为对角线,边长为3,
为边
上一点,过
点作
于
点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/4405328f-bdd0-4568-add4-9ebe271d1433.png?resizew=432)
(1)如图1,连结
,求线段
的长.
(2)保持
不动,将正方形
绕
点旋转至如图2的位置,连结
,
点为
的中点,连接
、
,探求
与
关系,并证明你的结论;
(3)保持
不动,将正方形
绕
点旋转一周,求出
的中点
在这个过程中的运动路径长及
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6469878a955cc09fac22ba5aea3fb962.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/4405328f-bdd0-4568-add4-9ebe271d1433.png?resizew=432)
(1)如图1,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
(3)保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图,正方形ABCD中,
,点M是射线BA上的一动点,
,垂足为P,
,与射线BC交于点N,连接DN.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/38e67b71-e2aa-4dbd-b5f3-77a6df7fb501.png?resizew=359)
(1)若点M在边AB上(与点B、A不重合).
①求证:
;
②连接DN,设
,
,求y与x的函数关系式,并写出函数定义域;
(2)若
,求出BM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b82fa8f506f8099ca06c36c706db479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d64e2ff568b33be0ac89de6358f4721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/728d203eedd888e6f30812b005a63729.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/38e67b71-e2aa-4dbd-b5f3-77a6df7fb501.png?resizew=359)
(1)若点M在边AB上(与点B、A不重合).
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de26ff144ea963055a68e4e471bd6714.png)
②连接DN,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b30a78dbab94d4d61eecc840f923d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f83cc0f8cf63bc84c70ac76c6c65160.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65b4d0f8b36652d0bc9a02888d67eb5.png)
您最近一年使用:0次