如图,
,在
内部作以点O为位似中心的正方形
,正方形
,正方形
,…,正方形
,其对应顶点
,都在射线
上,对应顶点
,都在射线
上,将正方形
的面积记作
,正方形
的面积记作
,正方形
的面积记作
,…,依此类推,正方形
的面积记作
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2ff5ce09-1682-43ec-916d-86b890670887.png?resizew=334)
(1)第5个正方形的面积
___________
(2)第 n个正方形的面积
___________
(3)若正方形的面积为
,则这是第几个正方形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6b253b7f7aa120fa6dd980bfc5fabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551d9dbea6e2147f1a626e58ce6e871c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e90dc669b9929e5857a5bba95d6ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0e0792b07debc56815a70f536c7c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6df581fd5dbe1c3de85000caf36186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c58291d6931ffd36ad9fd552d5bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1eb54d3bb25d58e32df5a2e621a47a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551d9dbea6e2147f1a626e58ce6e871c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e90dc669b9929e5857a5bba95d6ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0e0792b07debc56815a70f536c7c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6df581fd5dbe1c3de85000caf36186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54638dd4ebf19815a1333d84e42f927.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2ff5ce09-1682-43ec-916d-86b890670887.png?resizew=334)
(1)第5个正方形的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
(2)第 n个正方形的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
(3)若正方形的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2222a07494dbb2d091b80ed590877cbe.png)
更新时间:2022-12-10 17:49:54
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【推荐1】如图,在△ABC中,D为BC上一点,
,连接AD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/a35a79fa-0c2b-4914-acbb-0eaa33de86ae.png?resizew=169)
(1)若
,求证:△ACD为等腰三角形.
(2)若△ACD为直角三角形,求∠BAD的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454b4d6986dfa037582239adde91ad16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/a35a79fa-0c2b-4914-acbb-0eaa33de86ae.png?resizew=169)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50f357512a4b05fd9e79a315041d22e.png)
(2)若△ACD为直角三角形,求∠BAD的度数.
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【推荐2】【问题初探】
(1)数学活动课上,李老师给出了一个问题:如图1,在
中,
平分
,
.求证:
;
①如图2,小明同学从结论的角度出发给出如下解题思路:在
上截取
,连接
,将线段
,
,
之间的数量关系转化为
与
的数量关系;
②如图3,小强同学从
这个条件出发给出另一种解题思路:延长
至点E,使
,连接
,将
转化为
与
之间的数量关系.请你选择一名同学的解题思路,写出证明过程;
【类比分析】
(2)李老师发现两名同学都运用了转化思想,将证明三条线段的关系转化为证明两条线段的关系;为了帮助学生更好地感悟转化思想,李老师将图1进行变化并提出了下面问题,请你解答.
如图4,在
中,
,点D在
的延长线上,
,过点D作
交
的延长线于点E.求证:
;
【学以致用】
(3)如图5,在
中,
,垂足为D,
,
,
,
平分
交
于点E.求
的长.
(1)数学活动课上,李老师给出了一个问题:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00f4651b343dd8f9060c6460f0c955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49f97f97eb55b6b49b6a5eca1b7366b.png)
①如图2,小明同学从结论的角度出发给出如下解题思路:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②如图3,小强同学从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00f4651b343dd8f9060c6460f0c955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ac49caae8e3b8869d19beeff98966e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00f4651b343dd8f9060c6460f0c955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
【类比分析】
(2)李老师发现两名同学都运用了转化思想,将证明三条线段的关系转化为证明两条线段的关系;为了帮助学生更好地感悟转化思想,李老师将图1进行变化并提出了下面问题,请你解答.
如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d00f4651b343dd8f9060c6460f0c955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67b02e21fe94c40ef767b52549c5002.png)
【学以致用】
(3)如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4632573a37e7463b6c10e63d37200671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/d77b0fbf-6418-43c2-8123-f37dbd6a81cc.png?resizew=818)
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【推荐3】阅读下列相关材料,并完成相应的任务.
任务:
(1)请你完成这个定理的证明过程.
(2)该数学兴趣小组的同学在该定理的基础上写出了另外一个命题:若圆内接四边形的对角线互相垂直,则一边中点与对角线交点的连线垂直于对边请判断此命题是 命题.(填“真”或“假”)
(3)若
,求
的长.
布拉美古塔定理 婆罗摩笈多是古印度著名的数学家、天文学家,他编著了《婆罗摩修正体系》,他曾经提出了“婆罗摩笈多定理”,也称“布拉美古塔定理”.定理的内容是:若圆内接四边形的对角线互相垂直,则垂直于一边且过对角线交点的直线平分对边. 某数学兴趣小组的同学写出了这个定理的已知和求证. 已知:如图,在圆内接四边形 ![]() ![]() ![]() ![]() ![]() 求证:M是 ![]() |
(1)请你完成这个定理的证明过程.
(2)该数学兴趣小组的同学在该定理的基础上写出了另外一个命题:若圆内接四边形的对角线互相垂直,则一边中点与对角线交点的连线垂直于对边请判断此命题是 命题.(填“真”或“假”)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080d244a878edc259fd15056c883f12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
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【推荐1】如图,直线
分别与
轴、
轴相交于点
、
,边长为2的正方形
的一个顶点
在坐标系的原点,直线
与
相交于点
,若正方形绕着点
旋转一周,求点
到点(0,2)长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fceb9eb57ca36db386ffafeda213599c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/9/28/2817878498172928/2817944640675840/STEM/6d8866fe-e3b5-4e4d-954e-65177e63fccd.png?resizew=198)
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【推荐2】【备用性质】
对于正方形ABCD,具有下面的性质:
①四边都相等,即:AB=BC=CD=AD;
②四角都是直角,即:∠ABC=∠BCD=∠CDA=∠DAB =90°;
③对角线相等且互相平分,即:AC=BD=2AO=2BO;
④对角线互相垂直,即:AC⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/07c7b852-c84d-4cf0-b286-d12548fa954a.png?resizew=150)
【问题解决】
如图,点G是正方形ABCD对角线CA延长线上一点,以线段AG为边作正方形AGFE,EB与GD交于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/baa2bb44-25f6-44fa-900e-f474db378103.png?resizew=171)
(1)写出△EAB≌△GAD的理由;
(2)若BD=12,AG=2,求EB的长.
对于正方形ABCD,具有下面的性质:
①四边都相等,即:AB=BC=CD=AD;
②四角都是直角,即:∠ABC=∠BCD=∠CDA=∠DAB =90°;
③对角线相等且互相平分,即:AC=BD=2AO=2BO;
④对角线互相垂直,即:AC⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/07c7b852-c84d-4cf0-b286-d12548fa954a.png?resizew=150)
【问题解决】
如图,点G是正方形ABCD对角线CA延长线上一点,以线段AG为边作正方形AGFE,EB与GD交于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/baa2bb44-25f6-44fa-900e-f474db378103.png?resizew=171)
(1)写出△EAB≌△GAD的理由;
(2)若BD=12,AG=2,求EB的长.
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