综合与实践
在矩形
中,对角线
,
相交于点O,
,
,以点O为顶点作边长为2的正方形
,并将正方形
绕点O旋转,正方形与边
交于点P,与边
交于点Q.
【观察发现】
(1)如图1,当
时,G,Q,C三点重合,此时
与
的数量关系为______;
【猜想证明】
(2)当正方形
旋转到如图2所示的位置时,猜想
与
的数量关系,并说明理由;
【问题解决】
(3)在正方形的旋转过程中,当
时,请直接写出
的长.
在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b670c6d27ce68f17ac12c4efa1933db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b670c6d27ce68f17ac12c4efa1933db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【观察发现】
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b836a0f9c491f85767e8f6695576fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
【猜想证明】
(2)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b670c6d27ce68f17ac12c4efa1933db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
【问题解决】
(3)在正方形的旋转过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
更新时间:2024-04-08 14:48:22
|
相似题推荐
解答题-作图题
|
较难
(0.4)
【推荐1】已知下面的点阵中水平方向与竖直方向上任意两个相邻点间的距离都是1.
(1)如图1,A、B、C是点阵中的三个点,请在点阵中找到点D,作出线段
,使得
.
(2)如图2,线段
与
交于点O,小辉在点阵中找到了点E,连接
,恰好满足
于点F,再作出点阵中的其他线段,就可以构造相似三角形,经过推理和计算能够使问题得到解决.请你帮小辉计算
与
的值.
(3)如图3,线段
与
交于点O.在点阵中找到点E,连接
,满足
于点F,并求出
与
的值.
(1)如图1,A、B、C是点阵中的三个点,请在点阵中找到点D,作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)如图2,线段
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)如图3,线段
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584867635585024/2585213465608192/STEM/0e2242e196d34ed4aa70b14e057a4de3.png?resizew=487)
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【推荐2】上课时,老师要求同学们解决下面这道问题:
中,
,
,点E在边
上,将
沿
翻折,点D刚好落到边
上的点F处.
①
的长为______ ;
②求
的长.
请你也完成这道问题.
完成问题1后,老师进行了如下的变式:
(2)问题2:如图(b),矩形
中,
,
,若E为边
的中点,将
沿
翻折到
,延长
交
于点M,
的周长是多少?请你直接写出答案.
(3)问题3:如图(c),将矩形变为边长为6的正方形
,点E在边
上,
,将
沿
翻折到
,延长
交
于点N,请你直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
请你也完成这道问题.
完成问题1后,老师进行了如下的变式:
(2)问题2:如图(b),矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
(3)问题3:如图(c),将矩形变为边长为6的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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解答题-证明题
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名校
【推荐1】如图
,在
中,
,
,点
在
边上,
,过点
作
于点
,分别以
,
为邻边作平行四边形
,连接
,
.
(1)求
的大小;
(2)求证:
;
(3)如图
,将图
中的
绕点
旋转,其余条件保持不变,连接
求在旋转过程中,线段
长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/b4731944-d635-489d-aead-2dead09c8c2d.png?resizew=470)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708461e2af402d078520f53f0a1077a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图,平面直角坐标系中,直线
交x轴于点A,二次函数
(
,且a、c 是常数)的图像与x轴交于A、B两点(点A在点B的左侧),与y轴交于点C,与直线l交于点D.已知CD与x轴平行,且
.
![](https://img.xkw.com/dksih/QBM/2022/3/27/2944866977849344/2957756706201600/STEM/aa23b96f-0969-48bd-93bd-a80594a3b915.png?resizew=220)
(1)求点A的坐标;
(2)求此二次函数的解析式;
(3)点P为直线l上一动点,将线段AC绕点P顺时针旋转
得到线段
(点A、
是对应点,点
、
是对应点).请问:是否存在这样的点P,使得旋转后点
和点
分别落在直线l和抛物线
的图像上?若存在,请直接写出点A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0a06f1803631b0b3112ec57ca44a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1831b05b3ecb875374ab93a0b70d59c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6145d3e1f649bb406a8840771662d964.png)
![](https://img.xkw.com/dksih/QBM/2022/3/27/2944866977849344/2957756706201600/STEM/aa23b96f-0969-48bd-93bd-a80594a3b915.png?resizew=220)
(1)求点A的坐标;
(2)求此二次函数的解析式;
(3)点P为直线l上一动点,将线段AC绕点P顺时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19bc7ca33f2ca9705c9bf6bd8139021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1831b05b3ecb875374ab93a0b70d59c3.png)
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【推荐1】如图,∠AOB=90°,反比例函数y=﹣
(x<0)的图象过点A(﹣1,a),反比例函数y=
(k>0,x>0)的图象过点B,且AB
x轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/bd76ad47-2e0a-4cca-833c-2ea4ce6de634.png?resizew=175)
(1)求a和k的值;
(2)过点B作MN
OA,交x轴于点M,交y轴于点N,交双曲线y=
于另一点C,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641a95d729c3d7219f2869a94d7065bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5e38bf923d8cccc316100d1bf1b739.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/bd76ad47-2e0a-4cca-833c-2ea4ce6de634.png?resizew=175)
(1)求a和k的值;
(2)过点B作MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5e38bf923d8cccc316100d1bf1b739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
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【推荐2】定义:若一个三角形存在两个内角之差是第三个内角的两倍,则称这个三角形为关于第三个内角的“差倍角三角形”,例如,在△ABC中,∠A=100°,∠B=60°,∠C=20°,满足∠A-∠B=2∠C,所以△ABC是关于∠C的“差倍角三角形”;
(1)如图1,△ABC是关于∠C的“差倍角三角形”(其中∠BAC>∠B),AB=3,BC=9,点D在BC上,且∠BAD=∠C.求AC的长.
(2)如图2,等腰三角形ABC中,点D是底边BC的一个黄金分割点(CD<BD),且AB=AC=BD.求证:△ABC是关于∠B的“差倍角三角形”.
(3)如图3,五边形ABCDE内接于圆,连接AC,AD与BE相交于点F,G,BF=1,AB=BC=DE,△ABE是关于∠AEB的“差倍角三角形”.设AB=x,CD=y,求y关于x的函数关系式.
(1)如图1,△ABC是关于∠C的“差倍角三角形”(其中∠BAC>∠B),AB=3,BC=9,点D在BC上,且∠BAD=∠C.求AC的长.
(2)如图2,等腰三角形ABC中,点D是底边BC的一个黄金分割点(CD<BD),且AB=AC=BD.求证:△ABC是关于∠B的“差倍角三角形”.
(3)如图3,五边形ABCDE内接于圆,连接AC,AD与BE相交于点F,G,BF=1,AB=BC=DE,△ABE是关于∠AEB的“差倍角三角形”.设AB=x,CD=y,求y关于x的函数关系式.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712433980178432/2715277693149184/STEM/c4df69e0-a143-4f16-822b-e1b1094327d9.png?resizew=564)
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【推荐1】综合与探究
如图,抛物线y=﹣
与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,直线l经过B,C两点,点M从点A出发以每秒1个单位长度的速度向终点B运动,连接CM,将线段MC绕点M顺时针旋转90°得到线段MD,连接CD,BD.设点M运动的时间为t(t>0),请解答下列问题:
(1)求点A的坐标与直线l的表达式;
(2)①直接写出点D的坐标(用含t的式子表示),并求点D落在直线l上时的t的值;
②求点M运动的过程中线段CD长度的最小值;
(3)在点M运动的过程中,在直线l上是否存在点P,使得△BDP是等边三角形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
如图,抛物线y=﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005a24b37be6b6aecde11bc750dad008.png)
(1)求点A的坐标与直线l的表达式;
(2)①直接写出点D的坐标(用含t的式子表示),并求点D落在直线l上时的t的值;
②求点M运动的过程中线段CD长度的最小值;
(3)在点M运动的过程中,在直线l上是否存在点P,使得△BDP是等边三角形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084654171095040/2085783139008512/STEM/ab160a9e482d4f9cbbdd0a4a8b373ea4.png?resizew=357)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,
的半径为
,正三角形
的顶点B的坐标为
,顶点A在
上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/3d683a48-2b97-4aa6-ac05-c282e5485442.png?resizew=184)
(1)当点A在x轴正半轴上时,求点C的坐标;
(2)点A在运动过程中,是否存在直线
与
相切的位置关系?若存在,请直接写出点C的坐标;
(3)设点A的横坐标为x,
的面积为S,求S与x之间的函数关系式,并求出S的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/3d683a48-2b97-4aa6-ac05-c282e5485442.png?resizew=184)
(1)当点A在x轴正半轴上时,求点C的坐标;
(2)点A在运动过程中,是否存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)设点A的横坐标为x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-计算题
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较难
(0.4)
【推荐3】问题背景:折纸是一种将纸张折成各种不同形状的艺术活动,起源于中国,应用于全世界.折纸与自然科学结合在一起,发展出了折纸几何学,成为了现代几何学的一个分支,其中比较著名的芳贺折纸几何三定理,已成为折纸几何学的基本定理.
芳贺折纸第一定理的操作过程以及内容如下:
第一步:如图1,将正方形纸片
对折,使点
与点
重合,点
与点
重合,再将正方形
展开,得到折痕
;
第二步:将正方形纸片的右下角向上翻折,使点
与点
重合,边
翻折至
的位置,得到折痕
,
与
交与点
.
则点
为
的三等分点,即
.
问题解决:如图1,若正方形
的边长是8.
(1)
的长为________________.
(2)请通过计算
的长度,说明点P是
的三等分点.
类比探究:
(3)将矩形
按照上面的操作过程进行折叠,如图2,若折出的点P也为
的三等分点,则
的值为__________.
芳贺折纸第一定理的操作过程以及内容如下:
第一步:如图1,将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第二步:将正方形纸片的右下角向上翻折,使点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/9601d29de0a884953b039ee72f0158fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
则点
![](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/0762046501add3c10dc910a18bef799d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/6cd4c0ca-b0ab-49af-843a-70b5b50cf0ee.png?resizew=310)
问题解决:如图1,若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(2)请通过计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
类比探究:
(3)将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a112ee482c0359e0c38d9277e6ff8b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd172042ed396eb8ff692912613fb2d.png)
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