如图,
中,
,点
在
边上,
,点
在
延长线上,连结
,点
在
上,
交
于点
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/315b2a91-591d-468f-a502-1eb2d0985f1d.jpg?resizew=163)
(1)求证:
;
(2)求证:
为等边三角形;
(3)当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb43a62f3bfd7666ab898bcb5efc1ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa066a82c2f72448eb031f99541d524.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/315b2a91-591d-468f-a502-1eb2d0985f1d.jpg?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f842145a92b63d04c0fe88001f01d31e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5a1e516644950ef35eafd859b262f1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c339b0e700b7eef33972441df06faa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
更新时间:2024-03-09 13:37:10
|
相似题推荐
解答题-证明题
|
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(0.85)
名校
【推荐1】如图,平行四边形
的对角线
,
相交于点
.
,
是
上的两点,并且
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/31edc772-4c18-4028-88f6-8f378c11a8f0.png?resizew=182)
(1)求证:
.
(2)若
,连接
,
,判断四边形
的形状,并说明理由.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.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/dcf2e3236ea30ee2c37928b98041f13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/31edc772-4c18-4028-88f6-8f378c11a8f0.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e87371ec58bf581b1a41d63af89aa8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9332b9191d830338ed51f96422879f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
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【推荐2】如图所示,已知
、
相交于点E,
,
,证明:
是等腰三角形.
![](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/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ada52a0dae5711ac607f5384b2532a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/ad557043-cf89-4879-8aca-d6eaa6f1edea.jpg?resizew=140)
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【推荐1】如图,在四边形
中,
为对角线,
分别是
的中点,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05eace08194de9f75a0811ef9d101a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0675d37fc91d54b4afa4ffdbc3bb765d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2634c337e0f6c1951f01c9207ec179e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000af056ebe6fa34ddf84f61b93a32a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7479a816acc0939d1d66b7e33a592c54.png)
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【推荐2】如图,在四边形
中,线段
、
相交于点
,
,以
为边作等边
,点
位于四边形内部,连接
,
,
.
的度数;
(2)求证:
.
![](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/6ce072bcd423b56c827e40f0b731de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.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/cec69d43f611d65d9b0dc642a83f12ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7b375225716d355c3a7bc7098a85b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359bc7a47c723102813220ef7283177.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fed26111f78f74696b3d347196a63d5.png)
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解答题-作图题
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名校
【推荐3】如图,在
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/44a472e7-20c6-4bdd-b457-0638f085d2f2.png?resizew=188)
①分别以点A、B为圆心,以大于
的长度为半径作弧,分别交于两点,连接这两点的直线与
交于点D,与
交于点F,连结
;
②以点A为圆心,任意长为半径作弧,分别与
、
交于两点,再以这两点为圆心,以大于这两点间距离的一半的长度为半径作弧,两弧交于一点,连结点A与这一点交
于点E.
(1)通过以上作图,可以发现直线
是______,射线
是______;(在横线上填上合适的选项)
A.线段
的垂直平分线 B.
的角平分线
C.
的中线 D.
的角平分线
(2)在(1)所作的图中,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c157441734cc2f1853bb3e15b631a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/44a472e7-20c6-4bdd-b457-0638f085d2f2.png?resizew=188)
①分别以点A、B为圆心,以大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②以点A为圆心,任意长为半径作弧,分别与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)通过以上作图,可以发现直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
A.线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(2)在(1)所作的图中,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
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【推荐1】如图,
是
的切线,A为切点,连接
交
于点
,且
,
上有一点
且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/2a39e074-aafc-441a-980e-a28cda93715f.png?resizew=199)
(1)判断
的形状,并说明理由;
(2)求证:
是
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e014e670cda6ff07302f69a66592e3c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28352158ed28c59f5640dff186fc902b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/2a39e074-aafc-441a-980e-a28cda93715f.png?resizew=199)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c039801f714975eaae1748779792663c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,将矩形纸片ABCD按如下顺序进行折叠: 对折、展平, 得折痕EF(如图①); 沿GC折叠, 使点B落在EF上的点B′ 处(如图②); 展平, 得折痕GC(如图③); 沿GH折叠, 使点C落在DH上的点C′ 处(如图④); 沿GC′ 折叠(如图⑤); 展平, 得折痕GC′、GH(如图⑥).
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860174314930176/2864724662657024/STEM/4600b068-8884-4df8-98cc-bf38bfd72a8b.png?resizew=467)
(1)求图②中∠BCB′ 的大小;
(2)图⑥中的△GCC′ 是正三角形吗?请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860174314930176/2864724662657024/STEM/4600b068-8884-4df8-98cc-bf38bfd72a8b.png?resizew=467)
(1)求图②中∠BCB′ 的大小;
(2)图⑥中的△GCC′ 是正三角形吗?请说明理由.
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