已知,如图,
中,
,
,
,以斜边
为底边作等腰三角形
,腰
刚好满足
,并作腰上的高
.
(1)求证:
;
(2)求等腰三角形的腰长
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/f45776b9-ebba-44f7-8b93-70ecb8bfe391.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
(2)求等腰三角形的腰长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2023-06-09 19:36:43
|
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解答题-问答题
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【推荐1】回答下列问题.
(1)小明在预习说明“三角形内角和等于
”一节课时,抄写了如下预习笔记,不小心漏抄了部分理由,请你将漏抄的理由填写完整:
解:过
顶点A作
,
,(所作)
,
.(____)
点E,A,F在同一条直线上(所作),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.(____)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.(____)
(2)请你用不同的方法说明“三角形内角和等于
”
(1)小明在预习说明“三角形内角和等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/80e26d9a-b463-404c-9e3b-ce27a8080e93.png?resizew=173)
解:过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ea09a6ba4fb3e9b3f30418fd55d828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba55cf3b3f901257b77f507e51e7bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df967403d55bd48b70c4f75332b7169.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/41b7ce8ba6d3bc5d440d09d6058a445b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8ee8e3a10ea554320bf3fd3263185d.png)
(2)请你用不同的方法说明“三角形内角和等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/fda06508-cf42-41e5-a54a-7a543810d2e4.png?resizew=131)
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【推荐2】如图,在四边形ABCD中,已知
,连接BD,
交BD于点E,
交BD于点F,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1a23f51a2ff0896988930f5209fc64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26dba530ba1c15d3d3d5f90e0bf2810.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/2c77448a-ee6d-4aa8-9c54-8ce2371eda23.png?resizew=181)
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【推荐1】如图,在△ABC中,∠ACB=90°,AC=BC,点E是∠ACB内部一点,连接CE,作AD⊥CE,BE⊥CE,垂足分别为点D,E.
(1)求证:△BCE≌△CAD;
(2)若BE=5,DE=7,则△ACD的周长是 .
(1)求证:△BCE≌△CAD;
(2)若BE=5,DE=7,则△ACD的周长是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/3c3f5b46-b845-43fd-8665-ae93ba163dd6.png?resizew=107)
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【推荐2】(1)如图1,
中,
,
,直线
过点
,点
,
在直线
同侧,
于点
,
于点
.
证明:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/f456b143-8a52-4d39-abb1-ae57d5ee1b0b.png?resizew=673)
(2)应用:如图2,
,且
,
,且
,利用(1)中的结论,按照图中所标注的数据,计算实线所围成的图形的面积;
(3)拓展:如图3,等边
中,
,点
在
上,且
,动点
从点
沿射线
以
速度运动,连接
,将线段
绕点
逆时针旋转120°得到线段
.设点
运动的时间为
秒,直接 写出当
为何值时,点
恰好落在射线
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e77a906a317863df81327e97ae0d5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c129fbab6979fd83f4c1ef52feb35557.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/f456b143-8a52-4d39-abb1-ae57d5ee1b0b.png?resizew=673)
(2)应用:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
(3)拓展:如图3,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be25dd5a289b24fa89d9939ef0ff864f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6485afddd0b6fe46abc1d0a3268b30.png)
![](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/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
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【推荐1】五一假期期间,小育和小才约定一同去某公园游玩,如图,该公园有
两个门.经测量,东门
在西门
的正东方向,
米.小育自公园东门
处出发,沿北偏西
方向前往游乐场
处;小才自西门
处出发,沿正北方向行走一段距离到达C处后,然后沿北偏东
方向行走
米到达游乐场
处与小育汇合.
(1)求公园东门
与游乐场
之间的距离(结果保留根号);
(2)若小育和小才两人分别从
两门同时出发,假设两人前往游乐场
的速度相同.请计算说明小育和小才谁先到达游乐场
?(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.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/c46930231446457a10522c00a150aa2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/cba26720-c590-4542-8218-0724601330fc.png?resizew=183)
(1)求公园东门
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)若小育和小才两人分别从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a929d0d84e3654f03694adc8d1a326e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28099a02a19419a582bfb6f103fe0a3c.png)
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【推荐2】如图所示,在
中,
,
,
,点D在线段
上运动(不与点B,C重合),连接
,作
,
交边
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/44888204-584f-43bb-a6ce-bf6b2bb63982.png?resizew=183)
(1)当
时,
__________.
(2)当
等于多少时,
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3b58a4087b4a569572d93feceaec1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/44888204-584f-43bb-a6ce-bf6b2bb63982.png?resizew=183)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66f960a3bcd33415c0541fe5778f9c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06df3b822800139fd3ba2cb1ceaeaf73.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abaf30f9b5dba2fc7e55f0fbf1079c60.png)
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【推荐1】如图,四边形ABCD内接于⊙O,AC是⊙O的直径,DE⊥BC交BC延长线于点E,CD平分∠ACE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/08e6c5dc-7e94-4812-8cb0-9a6961cf90a9.png?resizew=180)
(1)求证DE是⊙O的切线;
(2)若AD=6,DE=4,求AC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/08e6c5dc-7e94-4812-8cb0-9a6961cf90a9.png?resizew=180)
(1)求证DE是⊙O的切线;
(2)若AD=6,DE=4,求AC的长.
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【推荐2】在矩形
中,
,F是对角线
上不与点A,C重合的一点,过F作
于E,将
沿
翻折得到
,点G在射线
上,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/820e6c09-e0b8-475d-a2bb-6cff07360275.png?resizew=260)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/c2922e6e-b900-4b0f-9456-5d59ec9dd545.png?resizew=334)
(1)如图1,若点A的对称点G落在
上,
,延长
交
于H,连接
.
①求证:
;
②求证:
,并求
的值;
(2)如图2,若点A的对称点G落在
延长线上,
,判断
与
是否全等,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abad06d82d2c27792707df69927e6b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e2c2b4ecbbd7084dc5327d74cd6740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/820e6c09-e0b8-475d-a2bb-6cff07360275.png?resizew=260)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/c2922e6e-b900-4b0f-9456-5d59ec9dd545.png?resizew=334)
(1)如图1,若点A的对称点G落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53efa8bb621843881e44d796a5b078d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac2fc39bdd7c270b06b5c33d08543ae.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62f8281efb366babb11f028161d9cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532a8820cb0beed0b19b0e0bea6dead7.png)
(2)如图2,若点A的对称点G落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f73365b56c24c02f0b45d98a80b45e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6b87e8fbd45bdbfc480508057c0298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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