如图,矩形
的对角线
和
相交于点F.延长
到C,使
,延长
到D,使
,连接
.
(1)求证:四边形
是平行四边形;
(2)求证:四边形
是菱形;
(3)若
,则菱形
的面积为_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20e9d6c7e003d1a312b722e5e7fd4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f842145a92b63d04c0fe88001f01d31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f8009e51eaf335280fdd5a8a4f5456.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/3/c8663726-7967-453d-822a-b22ca7207628.png?resizew=189)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe91f40604ff28000beaa77d8140f507.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf8e3ef1d918109c93d9182c3e46973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2023-07-31 17:08:12
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【推荐1】如图,AB是半圆O的直径,C是半圆O上的一点,CF切半圆O于点C,BD⊥CF于为点D,BD与半圆O交于点E,
(1)求证:BC平分∠ABD
(2)若DC=8,BE=4,求圆的直径.
(1)求证:BC平分∠ABD
(2)若DC=8,BE=4,求圆的直径.
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076839164059648/2077650940960768/STEM/3c135922-8b03-4a9f-a403-a768d2effd79.png?resizew=158)
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【推荐2】点M,N为正方形ABCD平面内两点,BM⊥BN.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2954304447832064/2957885806084096/STEM/8f5757f0-6b9a-4456-820a-9052c7e5a354.png?resizew=306)
(1)如图1,点M为边CD上一点,D,A,N三点共线.求证:BM=BN.
(2)如图2,点M为正方形ABCD外一点,CM⊥MN,M,A,N三点共线.BM=BN是否仍然成立,请说明理由.
(3)在(2)的条件下,若CM=1,BN=4
,求正方形的边长.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2954304447832064/2957885806084096/STEM/8f5757f0-6b9a-4456-820a-9052c7e5a354.png?resizew=306)
(1)如图1,点M为边CD上一点,D,A,N三点共线.求证:BM=BN.
(2)如图2,点M为正方形ABCD外一点,CM⊥MN,M,A,N三点共线.BM=BN是否仍然成立,请说明理由.
(3)在(2)的条件下,若CM=1,BN=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】(1)解方程:
.
(2)如图.在矩形ABCD中,对角线AC,BD相交于点O过点O作
于点M.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badbbfed5d59c52424ca441ef5bf8403.png)
(2)如图.在矩形ABCD中,对角线AC,BD相交于点O过点O作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d38359faa1d5ded10118ba9deaabbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f4e20b83f3a9572a0a2bca16cdc8d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/1efe1c75-1dd5-4eed-9106-e4d2c5d175ba.png?resizew=155)
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名校
【推荐2】定义:在三角形中,把一边的中点到这条边的高线的距离叫做这条边的中垂距.例:如图①,在
中,
为边
的中点,
于
,则线段
的长叫做边
的中垂距.
(1)设三角形一边的中垂距为
.若
,则这样的三角形一定是 ,推断的数学依据是 .
(2)如图②,在
中,
,
,
,
为边
的中线,求边
的中垂距.
(3)如图③,在矩形
中,
,
.点
为边
的中点,连结
并延长交
的延长线于点
,连结
.求
中边
的中垂距.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)设三角形一边的中垂距为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b2acdf36fb4dea1a3555187c3eb1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fa64abb0036dbff6a29f01b0c03899.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图③,在矩形
![](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/fc11331a7b2d2619b40ee6d34c3bd620.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐1】已知菱形的两条对角线和是10,当边长为多少时,菱形的面积最大?最大面积是多少?
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【推荐2】如图,为6×6的正方形网格,每个小正方形的顶点均为格点,在图中已标出线段AB,A,B均为格点,按要求完成下列问题.
(1)以AB为对角线画一个面积最小的菱形AEBF,且E,F为格点;
(2)在(1)中该菱形的边长是 ,面积是 ;
(3)以AB为对角线画一个菱形AEBF,且E,F为格点,则可画 个菱形.
(1)以AB为对角线画一个面积最小的菱形AEBF,且E,F为格点;
(2)在(1)中该菱形的边长是 ,面积是 ;
(3)以AB为对角线画一个菱形AEBF,且E,F为格点,则可画 个菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/d804c872-0618-4df5-afdc-f732109c050c.png?resizew=409)
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【推荐1】如图,在
中,
,C是
的中点,过点D作
,且
,连接
交
于F.
(1)求证:四边形
是菱形;
(2)若
,菱形
的面积为24,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7812fb18d08020f2d6c2633dc79b8ac3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/2431dbca-ad1d-4ee0-8ea4-c4610b388fd1.png?resizew=209)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ecc7afe00204e8a97c6b1241376119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】如图,在矩形
中,对角线
与
相交于点
,
,
.
求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3f982d999937891eec4cb22d62e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb225eb065ff68b6c992084c224a174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e7a8dc3a7944ae583fa232820bd0e5.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2aa635308ceb77a11597b2822c6f3b5.png)
![](https://img.xkw.com/dksih/QBM/2018/9/13/2031701955190784/2035980936093696/STEM/662a60c964ac46ad9fcc74fd88c2f28e.png?resizew=129)
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