如图所示:已知
中,
,在
内部作
分别交
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9769a59ce806e9c2cbee948b90bcf1c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/affe09c4-cbbe-4fd4-a4f4-8b8694987552.png?resizew=198)
[操作](1)将
绕点
逆时针旋转
,使
边与
边重合,把旋转后点
的对应点记作点
,得到
,请在图中画出
;(不写出画法)
[探究](2)在
作图的基础上,连接
, 求证: ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da18a33cdd1af7dadd43fe10e92b34c5.png)
[拓展](3)写出线段
和
之间满足的数量关系,并简要说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a598ebdc507626a3eda7f6224c3c48da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11abba9924a88ee7acbb42294b99fb0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9769a59ce806e9c2cbee948b90bcf1c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/affe09c4-cbbe-4fd4-a4f4-8b8694987552.png?resizew=198)
[操作](1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0468237bbc0d3df77435d98b817c10c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aebaf06bb1c96aecf49603c6a6bfcea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7eb1f15a73acf2bc341a0819c0d848b.png)
[探究](2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da18a33cdd1af7dadd43fe10e92b34c5.png)
[拓展](3)写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ada2d0f8dbb3c687c1041c1dd3a651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
19-20八年级下·山西晋中·阶段练习 查看更多[3]
山西省晋中市灵石县2019-2020学年八年级下学期阶段测试数学试题(已下线)专题12.26 全等三角形几何模型(半角模型)(分层练习)(综合练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题1.26 全等三角形几何模型(半角模型)(分层练习)(综合练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)
更新时间:2020-04-21 19:13:34
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】(1)观察推理:如图1,
中,∠ACB=90°,AC=BC,直线l过点C,点A,B在直线l同侧,BD⊥l,AE⊥l,垂足分别为D,E.求证:
;
(2)类比探究:如图2,
中,∠ACB=90°,AC=4,将斜边AB绕点A逆时针旋转 90°至
,连接
,求
的面积;
(3)拓展提升:如图3,等边
中,EC=BC=3cm,点O在BC上且OC=2cm,动点P从点E沿射线EC以1cm/s速度运动,连接OP,将线段OP绕点O逆时针旋转120°得到线段OF,设点P运动的时间为t秒,当
秒时,
,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804358dee78eabee6f9c3587259673c4.png)
(2)类比探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edd89df7200716269fd5792adf99121.png)
(3)拓展提升:如图3,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b6aea2c09a53eb8ba2305c895468af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a2005d40153650318652c639d4c046.png)
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619860888322048/2622638355873792/STEM/92a983c4-cca5-404e-9a43-585fa3fe5ba7.png?resizew=604)
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【推荐2】如图,
中,
,
,E点为射线
上一动点,连接
,作
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/fc8a568a-bf8b-47fb-b57b-cad50d09bfa5.png?resizew=390)
(1)如图1,过F点作
交
于D点,求证:
,并写出
和
的数量关系;
(2)如图2,连接
交
于G点,若
,求证:E点为
中点;
(3)当E点在射线
上,连接
与直线
交于G点,若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8807117d0d649419fdda04c531cdc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ed934aa29859e93b1f758229a12581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/fc8a568a-bf8b-47fb-b57b-cad50d09bfa5.png?resizew=390)
(1)如图1,过F点作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a97f515f014752b1c285c5f2e2646a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a80e55de1c163c13e2fbb335fded8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832f27d2fac4dff0e4c53976447306f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8672cf5551d71581bf5859e22c6af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)当E点在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7580e94c822a64f066307eefe910b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab63cec9b8be2f46673f4af414853f8.png)
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名校
解题方法
【推荐3】如图1,△ABC是等腰直角三角形,∠ACB=90°,AC=BC.D是BC上任意一点(点D与点B,C都不重合),连接AD,CF⊥AD,交AD于点E,交AB于点F,BG⊥BC交CF的延长线于点G.
![](https://img.xkw.com/dksih/QBM/2021/8/7/2781132270002176/2802029044072448/STEM/f5ce2cac-d7bc-4cea-993e-323652f97612.png)
(1)写出与BG相等的线段,并证明.
(2)若点D为线段BC的中点,其余条件不变,连接DF.根据题意,先在图2中补全图形,再证明:∠BDF=∠CDE.
(3)当点C和点F关于直线AD成轴对称时,直接写出线段CE,DE,AD三者之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2021/8/7/2781132270002176/2802029044072448/STEM/f5ce2cac-d7bc-4cea-993e-323652f97612.png)
(1)写出与BG相等的线段,并证明.
(2)若点D为线段BC的中点,其余条件不变,连接DF.根据题意,先在图2中补全图形,再证明:∠BDF=∠CDE.
(3)当点C和点F关于直线AD成轴对称时,直接写出线段CE,DE,AD三者之间的数量关系.
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解题方法
【推荐1】综合与实践
问题情境:
已知
是正方形
的对角线,将正方形
和正方形
按如图放置.
(1)如图1,使点
与点
重合,
与
相交于点
,
与
的延长线相交于点
.求证:
.
操作发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/fac4326b-e2f7-4bf7-a033-bea20f485c2a.png?resizew=186)
(2)如图2,使点
在
上(
,
两点除外),
与
相交于点
,
与
的延长线相交于点
.判断
和
的数量关系,并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/84c005c4-475d-46e4-b3f0-477cdc01916f.png?resizew=213)
拓广探索:
(3)如图3,使
在
上(
,
两点除外),
经过点
,
与正方形
的外角
的平分线
相交于点
.判断
和
的数量关系,并说明理由.
问题情境:
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc864d9ed17dc179305aa15090fe3eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图1,使点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
操作发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/fac4326b-e2f7-4bf7-a033-bea20f485c2a.png?resizew=186)
(2)如图2,使点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/84c005c4-475d-46e4-b3f0-477cdc01916f.png?resizew=213)
拓广探索:
(3)如图3,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585335ec741424ea43bbe068469df1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/3ed7f06d-6517-41ad-8e1a-33b51f084f4f.png?resizew=186)
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名校
【推荐2】如图1,在正方形
中,对角线
相交于点
,点
为线段
上一点,连接
,将
绕
点顺时针旋转
得到
,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252711653376/2492317705486336/STEM/fcde986204bb40d6b4e485cd83213026.png?resizew=457)
(1)若
,求
的面积;
(2)如图2,线段
的延长线交
于点
,过点
作
于点
,求证:
;
(3)如图3,点
为射线
上一点,线段
的延长线交直线
于点
,交直线
于点
,过点
作
垂直直线
于点
,请直接写出线段
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.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/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2020/6/18/2487252711653376/2492317705486336/STEM/fcde986204bb40d6b4e485cd83213026.png?resizew=457)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d855b839b3871930f971aab3abddf32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7807f6a0d316671ed34c23e32fc7408.png)
(2)如图2,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d3d08ffb5bd4afdc6ea1c47855686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41f9bbcf4cff35136c8457ab6918a13.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7112266920d2de81647265a337dc77d9.png)
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【推荐1】已知
,
,直线
是过点
的一条动直线(不与直线
,
重合),分别过点
,
作直线
的垂线,垂足为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/ac6c13b5-afd5-445c-b4b2-10b8511246f7.png?resizew=431)
(1)如图1,当
时,
①求证:
;
②连接
,过点
作
于
,过点
作
交
的延长线于点
.依题意补全图形,用等式表示线段
,
,
的数量关系,并证明;
(2)在直线
运动的过程中,若
的最大值为3,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053ac49d8359ba0206384ca0aaf2a911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/ac6c13b5-afd5-445c-b4b2-10b8511246f7.png?resizew=431)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e602010059da4d778792e88aa4e1851.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6dfd63cd67201f12c8983e479127e9.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344067523ee04f5cc546978ca0116e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】已知
,
,
为正数,满足如下两个条件:
①
②
证明:以
,
,
为三边长可构成一个直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d209bc95676225cc56ae398e54611961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6906e75de0ef41bfff6588f5c6872f15.png)
证明:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d012d124f04963fb72a68af40d5f8f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c462d08d75fcc7ccf9c3ecea1972e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9277dbbce271b4fa43757e565a9979c.png)
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(0.4)
【推荐1】皓皓在学习“两点之间线段最短”查阅资料时发现:
内总存在一点
与三个顶点连线的夹角相等,此时点
到
的三顶点的距离之和
的值最小,为了论证这个命题,皓皓做了以下探究:
(1)问题的转化:把
绕点A逆时针旋转
得到
,连接
,这样就把确定
的最小值的问题转化成确定
的最小值的问题了,请你利用图1,证明:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/2310e8bd-e755-4ec4-8c38-dfbd11de21ef.png?resizew=159)
(2)问题的解决:当点
到锐角
的三顶点的距离之和
的值为最小时,求
和
的度数.
(3)结论的应用:如图2是一个锐角为
的直角三角形,如果斜边为
,点
是这个三角形内一动点,请你利用以上方法,求点
到这个三角形各顶点的距离之和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
(1)问题的转化:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2efc07104b96c12c63663c9d39478493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40aae538e0e64257219502a212d83bd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a48450c7b40d3f3c2fd41356f7c9f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/2310e8bd-e755-4ec4-8c38-dfbd11de21ef.png?resizew=159)
(2)问题的解决:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
(3)结论的应用:如图2是一个锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/baf9877d-a157-435b-9e83-6644a8d97a6f.png?resizew=101)
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名校
解题方法
【推荐2】【问题发现】
(1)如图1所示,在
中,
,
,点
为
上一点,作
,
交
于点
,则
________;
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705625518080/2447943632347136/STEM/10e673e26eb34aa1a279470888637b83.png?resizew=168)
【类比研究】
(2)将
绕点
顺时针旋转到图2所示位置,此时(1)中的结论还成立吗?请说明理由;
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705625518080/2447943632347136/STEM/6f18c0c9ea4f4f35bed0701ad823e0ef.png?resizew=373)
【拓展延伸】
(3)若点
为
边中点,在
绕点
旋转的过程中,当
、
、
三点共线时,求
的长.
(1)如图1所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ec51114a238201386e801ad709eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8450b98818d11b26f189f6efbf6287ca.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705625518080/2447943632347136/STEM/10e673e26eb34aa1a279470888637b83.png?resizew=168)
【类比研究】
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705625518080/2447943632347136/STEM/6f18c0c9ea4f4f35bed0701ad823e0ef.png?resizew=373)
【拓展延伸】
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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