如图,在
中,
,
的垂直平分线交
于
,交
于
.
![](https://img.xkw.com/dksih/QBM/2022/11/25/3117277755744256/3118516746788864/STEM/9611862ba3a347e79e10e650e5edd5bd.png?resizew=105)
(1)若
,求
的度数.
(2)连接
,若
,
的周长是
.求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2022/11/25/3117277755744256/3118516746788864/STEM/9611862ba3a347e79e10e650e5edd5bd.png?resizew=105)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0374c406b563f0d258aa5c2654bbd06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b053d02df8dbf29235668c2beeaff0.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dcd1e5a4383edc90e632416ae17e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19daa2b38e3a52bd7096d235c843110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
更新时间:2022-11-27 09:41:28
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相似题推荐
解答题-证明题
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【推荐1】如图,点 B、F、C、E在同一直线上,AC、DF相交于点G,AB⊥BE,垂足为B,DE⊥BE,垂足为E,且 AB=DE,BF=CE.
(1)求证:AG=DG;
(2)若∠A=65°,求∠AGF 的度数.
(1)求证:AG=DG;
(2)若∠A=65°,求∠AGF 的度数.
![](https://img.xkw.com/dksih/QBM/2021/3/15/2678548404330496/2682849112350720/STEM/46134e0b-874a-441e-991e-b9b8900473b0.png)
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解答题-作图题
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【推荐2】尺规作图:经过已知直线外一点作这条直线的垂线.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/9e2c2f24-0105-46d7-abbf-eede88a30873.png?resizew=221)
(1)过点C作
的垂线
交
于点D.
(2)已知
,求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/9e2c2f24-0105-46d7-abbf-eede88a30873.png?resizew=221)
(1)过点C作
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282836891c171f38f62306a52106fd32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
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【推荐1】如图,等腰
中,
,
,点
在线段
上运动
不与
,
重合
,将
与
分别沿直线
,
翻折得到
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/1929b918-bd32-48e2-92f5-da6fc5eae41c.png?resizew=198)
(1)求证:
;
(2)求
的度数;
(3)当点
是
的中点时,判断
是何种三角形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7e49be1f66093e6f73b003d7b686b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4a514e2e338c6fa31c9938624a4a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b13964019381c4cd9de05f95c4261b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0719ae600f0efeeaba659bb54e2edc6e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/1929b918-bd32-48e2-92f5-da6fc5eae41c.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378ab247cf28dd1b17d48a508fa92176.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030314ca026d6b18481682f70f48d19b.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
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【推荐1】阅读下列材料,并完成任务.
三角形的外心
定义:三角形三边的垂直平分线相交于一点,这个点叫做三角形的外心.
如图1,直线
,
,
分别是边
,
,
的垂直平分线.
求证:直线
,
,
相交于一点.
证明:如图2,设
,
相交于点
,分别连接
,
,
.
∵
是
的垂直平分线,
∴
,(依据1)
∵
是
的垂直平分线,
∴
,
∴
,(依据2)
∵
是
的垂直平分线,
∴点
在
上,(依据3)
∴直线
,
,
相交于一点.
(1)上述证明过程中的“依据1”“依据3”分别指什么?
(2)如图3,直线
,
分别是
,
的垂直平分线,直线
,
相交于点
,点
是
的外心,
交
于点
,
交
于点
,分别连接
,
,
,
,
.若
,
的周长为
,求
的周长.
三角形的外心
定义:三角形三边的垂直平分线相交于一点,这个点叫做三角形的外心.
如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.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/60ef95894ceebaf236170e8832dcf7e3.png)
求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
证明:如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/4d86bee8-8c3a-4eef-8f7c-550eb52ecc18.png?resizew=486)
(1)上述证明过程中的“依据1”“依据3”分别指什么?
(2)如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.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/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1575126c29c6ea9b4915794f7a3144eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a79fa14c8f71cdd5af3ba00ac5824a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
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解答题-作图题
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【推荐2】如图,在等腰三角形ABC中,
.先作出它的对称轴,然后作点E的对称点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/a2de4b8b-4373-493b-88d9-d2a6ce5f88ed.png?resizew=156)
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解答题-作图题
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名校
【推荐1】如图,在平行四边形
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/cf3169e9-5bfe-467b-9055-5cca67cf35f8.png?resizew=161)
(1)尺规作图:作
的平分线
,交
于点
,交
于点
(只保留作图痕迹);
(2)在(1)所作的图形中,求证:
.(思路是通过证明两个三角形全等得出对应线段相等,请补全下面的证明过程.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
证明:
,
,
.
.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf8b46a76a6b36d497f0026a9924356.png)
.
又
,
.
.
四边形
是平行四边形,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcad5bb067e4f75693f4af4257b1d12.png)
.
在
和
中,
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3104c05e255396a91038e2896aedf5cc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/cf3169e9-5bfe-467b-9055-5cca67cf35f8.png?resizew=161)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)在(1)所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bae20ce509b25695607c660bf7023fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4046f62f73ca345f5ad182fc0c71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3104c05e255396a91038e2896aedf5cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b264f250b25faaebd508bb5ae7836849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365c47fdfb0ab3bf69ab54e93c7d255a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf8b46a76a6b36d497f0026a9924356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ec53045e1b5cb22a686c9765ce6cb.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1051900ac823a78a7340c5a01d4234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2fba683b801d290362ab64cd729c8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcad5bb067e4f75693f4af4257b1d12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119c45ce9bb2725de4b6aae2a7ac369e.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a0c85deb80d8e63bc60127e803f7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44e3aaa4561395b8fef322f7f6d9908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe6731b1b3950ff11a85c6e7d41bd64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54c53afd54a57877c2efd1628230b82.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,在
中,
于D,
于E,
与
相交于点G,
于H.求证:
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111669412708352/3114251073216512/STEM/f4ca88b3ff7b4851bdb49688151fd0e3.png?resizew=175)
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1647c3c13572b403c5621f9b2a3086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b676dfde981c8baab99e65a6e1966c.png)
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111669412708352/3114251073216512/STEM/f4ca88b3ff7b4851bdb49688151fd0e3.png?resizew=175)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ffae2f77df57a8e121fdb1ec02bb5.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb7e2853529a63f5f98c59a332a9d0c.png)
您最近一年使用:0次