如图,在菱形
中,对角线
交于点O,点E,F分别为边
上的中点,连接
.
(1)求证:
;
(2)若
,
,求菱形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d0b0b7d07ac1aebab6b6f1e8c6acdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/210830766989a07c24b05589007aebbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/9224453f-bcdc-4210-83c6-5f33adf2fd6d.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ea82545fa8d6208d026a60a68e8131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
2023·湖南长沙·一模 查看更多[2]
更新时间:2023-05-23 16:55:40
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解答题-问答题
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【推荐1】如图,
是等腰三角形,
,点
是边
上的一点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0225ceb0-cbbb-49f0-9bf4-4b0bbac81db6.png?resizew=133)
(1)若
的周长是
,
,点
是
的中点,求
的长;
(2)若
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0225ceb0-cbbb-49f0-9bf4-4b0bbac81db6.png?resizew=133)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c04902d8ae0503af2aeccbf98f61f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7c5675d8c687200645270dbfba9083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ec4f71a8caf880bca7574f122f07fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecee881827223bfabdc4c2a286e34ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd9d576c9596ab55839c40a42d63c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐2】如图,在等腰直角
中,
,点D,E在边BC上,且
,将
绕点A逆时针旋转90°得到
,连接EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/8a4c44ad-167a-40ed-bea4-012ab5ec14a1.png?resizew=184)
(1)求证:
.
(2)若
,
,求CE.
![](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/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/8a4c44ad-167a-40ed-bea4-012ab5ec14a1.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406e7d1e7977dd5b30ef81cfdc8e8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
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【推荐1】如图,点D是ABC内一点,点E,F,G,H分别是AB,AC,CD,BD的中点.
![](https://img.xkw.com/dksih/QBM/2022/8/31/3056417622515712/3068551704748032/STEM/68b620e9618d4ce7afbb7e062237e486.png?resizew=116)
(1)求证:四边形
是平行四边形;
(2)如果
,
,
,
,求四边形
的周长.
![](https://img.xkw.com/dksih/QBM/2022/8/31/3056417622515712/3068551704748032/STEM/68b620e9618d4ce7afbb7e062237e486.png?resizew=116)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587458141d890533c0c32aa249a27ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1983c41ebdacc818687e43642f8fb670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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【推荐2】如图,AN平分∠BAC,BN⊥AN于点N,延长BN交AC于点D,M是
ABC的边BC的中点,已知AB=10,BC=16,MN=4.
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730895713853440/2737430949699584/STEM/15ac24e948ec4192b8b0439a6573f240.png?resizew=185)
(1)求证:BN=DN
(2)求
ABC的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730895713853440/2737430949699584/STEM/15ac24e948ec4192b8b0439a6573f240.png?resizew=185)
(1)求证:BN=DN
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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【推荐1】如图,在菱形
中,对角线
与
相交于点
,且
,
,求菱形的高
的长度是多少?
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18444ec3e5e3b8a0cf488732c34866d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/aa8c2b1f-e2c6-4f47-8982-bb4a50a7510e.png?resizew=132)
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【推荐2】如图,在菱形
中,
于点E,
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/2d1a9882-7235-499d-b7ab-27ffd70b618a.png?resizew=326)
(1)求证:
;
(2)分别延长
和
相交于点G,若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/2d1a9882-7235-499d-b7ab-27ffd70b618a.png?resizew=326)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
(2)分别延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图,在半径为6的
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