如图,△ABC∽△DEC,CA=CB,且点E在AB的延长线上.
![](https://img.xkw.com/dksih/QBM/2021/11/2/2842666266779648/2930220589555712/STEM/48a3bc6e43e44ce1a897146da8e09c01.png?resizew=112)
(1)求证:AE=BD;
(2)求证:△BOE∽△COD.
(3)已知:CD=10,BE=5,OD=6,求OC的长.
![](https://img.xkw.com/dksih/QBM/2021/11/2/2842666266779648/2930220589555712/STEM/48a3bc6e43e44ce1a897146da8e09c01.png?resizew=112)
(1)求证:AE=BD;
(2)求证:△BOE∽△COD.
(3)已知:CD=10,BE=5,OD=6,求OC的长.
更新时间:2022-03-06 08:51:57
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【推荐2】如图①,点O是线段AD上一动点(不与点A、D重合),分别以AO和DO为边在AD的同侧作等边三角形OAB和等边三角形OCD,连结AC、BD相交于点E,连结OE.
(1)当点O为AD的中点时,求∠DEA的度数;
(2)在(1)的条件下,△ADE是轴对称图形吗?如果是,指出它的对称轴;如果不是,说明理由;
(3)当点O不在AD的中点时,求证EO平分∠DEA.
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301960058707968/2302553049538560/STEM/4f05389c0e9542ea972f4f4dc6b51624.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301960058707968/2302553049538560/STEM/dc2b8716f6e14e4197d562f3a4f4f451.png?resizew=180)
图① 图②
(1)当点O为AD的中点时,求∠DEA的度数;
(2)在(1)的条件下,△ADE是轴对称图形吗?如果是,指出它的对称轴;如果不是,说明理由;
(3)当点O不在AD的中点时,求证EO平分∠DEA.
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301960058707968/2302553049538560/STEM/4f05389c0e9542ea972f4f4dc6b51624.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301960058707968/2302553049538560/STEM/dc2b8716f6e14e4197d562f3a4f4f451.png?resizew=180)
图① 图②
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【推荐1】如图,在
中,
,以
为边,作
,满足
,点E为
上一点,连接
,
,连接
.
(1)若
,求证
;
(2)求证:
;
(3)猜想线段
、
、
的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5145d5256b80df4b57acf3499b04d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/9cc536b0-e373-4d95-9272-c9099f77305c.png?resizew=332)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b1472e121da0ae5550329cfda5f0a2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c22d8b487471de6a8e990b20c6d5f73.png)
(3)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图,在
和
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/d6e451a4-5b55-43d6-a543-f08ee1efebc5.png?resizew=199)
(1)试说明:
;
(2)
与
相交于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0785412ab2f3b729b9afbe47cf26e4b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/d6e451a4-5b55-43d6-a543-f08ee1efebc5.png?resizew=199)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
(2)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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【推荐1】如图,在
中,
,
是
的平分线,
的平分线
交
于点
,点
在
上,以点
为圆心,
的长为半径的圆经过点
,交
于点
,交
于点
.
(1)求证:
为
的切线;
(2)当
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时,求线段
的长.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/10896d21-6c70-4f5c-b690-3dc8b8cb2c26.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
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【推荐2】在
中,
,
,
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(1)找出图中的相似三角形,并证明;
(2)求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)找出图中的相似三角形,并证明;
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【推荐1】如图,小明同学在晚上由路灯
走向路灯
,当他行到
处时发现,他在路灯
下的影长为3米,且恰好位于路灯
的正下方,接着他又走了6米到
处(即
米),此时他在路灯
下的影子恰好位于路灯
的正下方(已知小明身高1.6米,路灯
高8米).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/dd98689c-28bd-43f8-bff0-6e502655d5c1.png?resizew=188)
(1)小明站在
处在路灯
下的影子是线段______;
(2)计算小明站在
处在路灯
下的影长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5886d4b31a8d7249d3eea076d1f40354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/dd98689c-28bd-43f8-bff0-6e502655d5c1.png?resizew=188)
(1)小明站在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)计算小明站在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解题方法
【推荐2】
和
都是等腰直角三角形,
,
为
中点
(1)若
、
分别在
、
上,如图所示,求证:
;
(2)将如图所示中
绕
点顺时针旋转
,如图所示,问(1)中的结论是否仍然成立?请说明理由;
(3)将如图所示中
绕
点顺时针旋转到如图所示,问(1)中的结论是否仍然成立?请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222633205096448/2223306361643008/STEM/2c3ffac2fef147e59b3d1205fda9bacf.png?resizew=309)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8df3351ba098bf7cbfd0b59a29ce2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ca20b0115d2dabebd4103f45d8df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f0739138cf1f460edcfbff3f843ad4b.png)
(2)将如图所示中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8df3351ba098bf7cbfd0b59a29ce2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
(3)将如图所示中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8df3351ba098bf7cbfd0b59a29ce2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222633205096448/2223306361643008/STEM/2c3ffac2fef147e59b3d1205fda9bacf.png?resizew=309)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222633205096448/2223306361643008/STEM/885ff0fdda314a1298c0d5dc13c3efab.png?resizew=150)
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