定义:在
中,若
,
,
,
,
,
满足
则称这个三角形为“类勾股三角形”.请根据以上定义解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/adbd33cf-e318-44e7-9ec7-184a7406376b.png?resizew=396)
(1)命题:“直角三角形都是类勾股三角形”是________(填“真”或“假”)命题.
(2)如图1所示,若等腰三角形
是“类勾股三角形”,
,
,请求
的度数.
(3)如图2所示,在
中,
,且
,求证:
为“类勾股三角形”.志明同学想到可以在
上找一点
使得
,再作
,请你帮助志明完成证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a3efeaae94f2c07971efa9efb9cfe3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/adbd33cf-e318-44e7-9ec7-184a7406376b.png?resizew=396)
(1)命题:“直角三角形都是类勾股三角形”是________(填“真”或“假”)命题.
(2)如图1所示,若等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da34cf9e12ae21e20af861a581ca0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)如图2所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf7bbcc6deed520368b89c90502dab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110eee92e107c833e7b9ca93e55f901d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
更新时间:2023-08-02 00:22:02
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,抛物线
经过
、
两点,与
轴交于点
,
为
轴上一点,点
关于直线
的对称点为
.
(1)求抛物线的解析式;
(2)当点
刚好落在第四象限的抛物线上时,求出点
的坐标;
(3)点
在抛物线上(不与点
重合),连接
,是否存在点
,使
是以
为直角顶点的等腰直角三角形?若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f2b522cd26c41756055757c4493c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb32425d936127e7cddafbe98382d0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729a5357eba25f80b14c35a9317db5ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4171e7f713d6b265d56b2662b7af57b.png)
(1)求抛物线的解析式;
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4171e7f713d6b265d56b2662b7af57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6b93dbe5272a5167ff4e2918bec864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0282bf376c7f9cfd82edc09009f7310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625d4c424b90a21230ab22fb52dff479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/6729e71c-6018-4c70-8bdc-7b1940dd0ee7.png?resizew=134)
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【推荐2】如图,在平面直角坐标系中,已知直线
与直线
相交于点
。
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147512426496/2367103568150528/STEM/7df3b6b3cf8049a2a8d7c128ee9b8905.png?resizew=298)
(1)求点
的坐标;
(2)点
是
内部一点,连接
,求
的最小值;
(3)将点
向下平移一个单位得到点
,连接
,将
绕点
旋转至
的位置,使
轴,再将
沿
轴上下平移得到
,在平移过程中,直线
与
轴交于点
,在直线
上任取一点
,连接
,
,
能否以
为直线边构成等腰直角三角形?若能,请直接写出所有符合条件的
点的坐标,若不能,请说明理由。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7cc19236bf046143c787674363d11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68b443e9443d5194a206f321ec67dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366147512426496/2367103568150528/STEM/7df3b6b3cf8049a2a8d7c128ee9b8905.png?resizew=298)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28583843aa8c06a4ec3a7e90489ced94.png)
(3)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a33e4f7ad1efdbd7d111090f8ef79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e568f9910252b0b230a4235095bb12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca54ff0ce454b9a91c7c05247435786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e568f9910252b0b230a4235095bb12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859008f370c07cded0966027aad30c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c43f25751ac9c9614b26ca30dd9c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23d2c83da2b36d6df8fd2340aa9d08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5529046d232de846352a439d991439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d6295224d0c12333931cf8b9a5474a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36fbd4d9973be66c71311018b4777d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6822eb9bee42b219a1a5cfae5bbee381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
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解答题-证明题
|
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(0.4)
名校
【推荐1】如图,
的直径
为10,弦
为6,D是
的中点,弦
和
交于点F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/f011b9fd-eedf-4f98-bc90-eeba71826b0f.png?resizew=165)
(1)求证:
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.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/c2e94399c4924cf2a862737a2825fe4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/f011b9fd-eedf-4f98-bc90-eeba71826b0f.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3224eea0f01fdff8b9c258beffc50e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】问题提出
(1)如图①,在
中,
,
的平分线交
于点D,过点D分别作
,垂足分别为点E、F,则图①中与线段
相等的线段是_______;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/a19fb040-99e2-405d-a597-7c1fb54c2c9b.png?resizew=147)
问题探究
(2)如图②,
是半圆O的直径,
,P是
上一点,且
,连接
、
,
的平分线交
于点C,过点C分别作
垂足分别为点E、F,求线段
的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/e51f9183-787d-4373-8e52-3e7ccc2ce9f9.png?resizew=174)
问题解决
(3)如图③是某公园内“少儿活动中心”的设计示意图,已知
的直径
,点C在
上,且
,P为
上一点,连接
并延长,交
于点D,连接
、
.过点P分别作
,垂足分别为点E、F.按设计要求,四边形
内部为室内活动区,阴影部分是户外活动区,圆内其余部分为绿化区,设
的长为x米,阴影部分的面积为y平方米.求y与x之间的函数关系式.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777b2fbc01cfc26cde436f625a5b7cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed17a2e63de0b0bb05683f1df32be415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535ae08686abe8e4882b6b9cdf3e5b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/a19fb040-99e2-405d-a597-7c1fb54c2c9b.png?resizew=147)
问题探究
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e6437cf95a5cc5b920fa0cfed0eb50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02774c7b6949eb4c18095963530ab62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/e51f9183-787d-4373-8e52-3e7ccc2ce9f9.png?resizew=174)
问题解决
(3)如图③是某公园内“少儿活动中心”的设计示意图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b8b869b1d22daa610ffd453eb06f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b128d4aeb3eacab7751bfb7a03af30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/17c7d2d5-b8b8-44f4-a2cc-44ee82bc2a43.png?resizew=151)
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解题方法
【推荐1】我们知道:直角三角形斜边上中线于斜边的一半.爱好数学研究的剑汇同学进一步思考:如图1,在
中,
,斜边
上除了中点
外还有没有一点
,使得
?如果存在,我们不妨纰将该线段
称为“剑汇线”
![](https://img.xkw.com/dksih/QBM/2022/12/5/3124050634194944/3128721380900864/STEM/b63f032653094675b30e6c93b1e06636.png?resizew=243)
(1)命题:任意一个直角三角形一定存在“剑汇线”,该命题是 命题.(填“真”或“假”
;
(2)已知在
中,
,
,
存在“剑汇线”
.若
.
①当
时,求
的长;
②随着
的变化,
的长也变化,直接写出
的变化范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6f92af20e5d3cccfec3d756e63ba85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/2022/12/5/3124050634194944/3128721380900864/STEM/b63f032653094675b30e6c93b1e06636.png?resizew=243)
(1)命题:任意一个直角三角形一定存在“剑汇线”,该命题是 命题.(填“真”或“假”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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①当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②随着
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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较难
(0.4)
【推荐2】我们知道,四边形有两组对边,两组对角,两条对角线.已经研究了,如果四边形满足下列条件之一:①两组对边分别平行;②两组对边分别相等;③一组对边平行且相等;④对角线互相平分,那么这个四边形是平行四边形.由此,进一步探究
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/86bdf940-e52d-4fa8-91ec-a2f8d2632528.png?resizew=335)
(1)如图①,在四边形ABCD中,∠A=∠C,∠B=∠D.求证:四边形ABCD是平行四边形.
(2)命题:如果四边形满足一组对边平行且另一组对边相等,那么这个四边形是平行四边形.如果这个命题是真命题,请证明;否则,请画出一个反例示意图,并标明所满足的条件.
(3)命题:如果四边形满足一组对边相等且一条对角线平分另一条对角线,那么这个四边形是平行四边形.
①小明认为这是假命题,尝试画出反例.如图②,他先画出四边形ABCD的一条边AB,一条对角线BD.请你利用无刻度直尺和圆规在图②中画出反例.(保留作图痕迹,不写作法)
②小明进一步探索发现,在四边形ABCD中,AB=CD,对角线AC、BD相交于点O,且OB=OD,BD=8,∠AOB=60°,对于满足条件的平行四边形ABCD的个数随着AB长度的变化而变化,直接写出平行四边形ABCD的个数及对应的AB的长的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/86bdf940-e52d-4fa8-91ec-a2f8d2632528.png?resizew=335)
(1)如图①,在四边形ABCD中,∠A=∠C,∠B=∠D.求证:四边形ABCD是平行四边形.
(2)命题:如果四边形满足一组对边平行且另一组对边相等,那么这个四边形是平行四边形.如果这个命题是真命题,请证明;否则,请画出一个反例示意图,并标明所满足的条件.
(3)命题:如果四边形满足一组对边相等且一条对角线平分另一条对角线,那么这个四边形是平行四边形.
①小明认为这是假命题,尝试画出反例.如图②,他先画出四边形ABCD的一条边AB,一条对角线BD.请你利用无刻度直尺和圆规在图②中画出反例.(保留作图痕迹,不写作法)
②小明进一步探索发现,在四边形ABCD中,AB=CD,对角线AC、BD相交于点O,且OB=OD,BD=8,∠AOB=60°,对于满足条件的平行四边形ABCD的个数随着AB长度的变化而变化,直接写出平行四边形ABCD的个数及对应的AB的长的取值范围.
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