如图1,
,
是直线
上两点,点
在点
左侧,过点
的直线
与过点
的直线
交于点
.直线
交直线
于点
,满足点
在线段
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/98f0e9b2-ddb7-4168-b232-8bcd58312b79.png?resizew=565)
(1)求证:
;
(2)如图2,点
在直线
,
之间,
平分
,
平分
,点
,
,
在同一直线上,且
,求
的度数;
(3)在(2)的条件下,若点
是直线
上一点,直线
交直线
于点
,点
在点
左侧,请直接写出
和
的数量关系.(题中所有角都是大于
且小于
的角)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5634a208294350f8ec151cd19b6d3278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f4025c43ff4be093dc2ef9f848c367.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/98f0e9b2-ddb7-4168-b232-8bcd58312b79.png?resizew=565)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](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/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c9cacdf636d2598c6b537449a8942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229b8447cb77e1e7b23f744a3246aefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0d4b9f3299d690d7c77eb2f4808c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c9cacdf636d2598c6b537449a8942.png)
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922cba763fb3233f69dca043bff35587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbd1ec78097e0948b213468f7d3028a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
22-23八年级上·四川达州·期末 查看更多[2]
四川省达州市开江县2022-2023学年八年级上学期期末数学试题(已下线)压轴真题必刷03 平行线和三角形内角和定理(压轴30题5种题型训练)-2023-2024学年八年级数学上学期期末考点大串讲(北师大版)
更新时间:2023-01-18 16:26:40
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相似题推荐
解答题-证明题
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【推荐1】如图,在
中,
,以点
为圆心,
长为半径作
,交
于点
,交
延长线于点
,
是
的切线,连接
.
;
(2)若
的半径为
,当四边形
为菱形时,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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b1405137f3fdd1fff5fd5de96c0fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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名校
【推荐2】在等边
中,
为射线
上一点,
是
外角的平分线,
,
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/f9a7801a-5eb7-4d92-9c96-df0ba47eca61.png?resizew=415)
(1)如图1,求证
;
(2)如图1,若点
在线段
上(不与
,
点重合),求证:
;
(3)如图2,若点
在线段
的延长线上,(2)中的结论是否仍然成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d40d5cb59338d3cb1dd504bb12d107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/f9a7801a-5eb7-4d92-9c96-df0ba47eca61.png?resizew=415)
(1)如图1,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
(2)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/64f56245f57518983e0d8a9ee8dc1dcb.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】【阅读材料】
在“相交线与平行线”的学习中,有这样一道典型问题:
,点P在
与
之间,可得结论:
.
理由如下:
过点P作
.
∴
.
∵
,
∴
.
∴
.
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7bc7c26d8a20f67adbdc93c2e195c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/109f42fe5d9c409a2c61eb71298cb914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fb162bb4eca29f27aca9c436a605f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f319c2a522fa64984577e0f04af2c5.png)
【问题解决】
(1)如图②,
,点P在
与
之间,可得
间的等量关系是 ;(只写结论)
(2)如图③,
,点P,E在
与
之间,
,
,写出
与
间的等量关系,并写出理由;
(3)如图③,
,点P,E在
与
之间,若
,
,可得
与
间的等量关系是 ;(只写结论)
(4)如图④,
,点P,E在
与
之间,
,
.可得
与
间的等量关系是 .(只写结论)
在“相交线与平行线”的学习中,有这样一道典型问题:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/94c1771954130b48a3bbe2d7f6e37f7f.png)
理由如下:
过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54a42a4c4f5154b0036065137d0aef9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10bb426e00de29d8664ca5babb2f4f3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d43f510d7f72683ef3dfb8cc9a379ca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7bc7c26d8a20f67adbdc93c2e195c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/109f42fe5d9c409a2c61eb71298cb914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fb162bb4eca29f27aca9c436a605f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f319c2a522fa64984577e0f04af2c5.png)
【问题解决】
(1)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/948e753d402b25e217922138a1e2527c.png)
(2)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/05b0d0c8d97230d376f23c242483fdc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3253cd54532b42f25778686193bde88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/becd2c8fb5e0c4f647b2b188136fd054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a74bad8486353790d06f68b17ebb824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
(4)如图④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/c0a89b71533d764d33c9ef4d0d850892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347d83dc14387d3f5f500a63fd4b175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
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【推荐2】探究
(1)已知如图1,若AB∥CD,P为平行线内的一点请你判断∠B+∠P+∠D= 度,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/20/2423566215667712/2423781875982336/STEM/616d7b8e-3cbc-445e-9ca7-9ec47df49380.png?resizew=471)
(2)如图2,若AB∥CD ,P1、P2为平行线内的两个点,请求出∠B+∠P1+∠P2+∠D= 度(不需要说明理由)
(3)如图3,如此类推若AB∥CD,P1、、P2、P3、P4、……Pn为平行线内的n个点,请求出∠B+∠P1+∠P2+∠P3+…….+∠Pn-1+∠Pn+∠D= 度(不需要说明理由)
(1)已知如图1,若AB∥CD,P为平行线内的一点请你判断∠B+∠P+∠D= 度,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/20/2423566215667712/2423781875982336/STEM/616d7b8e-3cbc-445e-9ca7-9ec47df49380.png?resizew=471)
(2)如图2,若AB∥CD ,P1、P2为平行线内的两个点,请求出∠B+∠P1+∠P2+∠D= 度(不需要说明理由)
(3)如图3,如此类推若AB∥CD,P1、、P2、P3、P4、……Pn为平行线内的n个点,请求出∠B+∠P1+∠P2+∠P3+…….+∠Pn-1+∠Pn+∠D= 度(不需要说明理由)
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【推荐1】在平面直角坐标系中,D(0,﹣3),M(4,﹣3),直角三角形ABC的边与x轴分别相交于O、G两点,与直线DM分别交于E、F点,∠ACB=90°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/630719ad-4bf2-47f1-a695-06152f49b51a.png?resizew=596)
(1)将直角三角形如图1位置摆放,如果∠AOG=46°,则∠CEF= ;
(2)将直角三角形ABC如图2位置摆放,N为AC上一点,
①若∠NEC+∠CEF=180°,请直接写出∠NEF与∠AOG之间的等量关系: ;
②若∠NED+∠CEF=180°,请判断∠NEF与∠AOG之间的等量关系,并说明理由.
(3)将直角三角形ABC如图3位置摆放,若∠GOC=140°,延长AC交DM于点Q,点P是射线GF上一动点,探究∠POQ,∠OPQ与∠PQF的数量关系,请直接写出结论(题中的所有角都大于0°小于180°): .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/630719ad-4bf2-47f1-a695-06152f49b51a.png?resizew=596)
(1)将直角三角形如图1位置摆放,如果∠AOG=46°,则∠CEF= ;
(2)将直角三角形ABC如图2位置摆放,N为AC上一点,
①若∠NEC+∠CEF=180°,请直接写出∠NEF与∠AOG之间的等量关系: ;
②若∠NED+∠CEF=180°,请判断∠NEF与∠AOG之间的等量关系,并说明理由.
(3)将直角三角形ABC如图3位置摆放,若∠GOC=140°,延长AC交DM于点Q,点P是射线GF上一动点,探究∠POQ,∠OPQ与∠PQF的数量关系,请直接写出结论(题中的所有角都大于0°小于180°): .
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【推荐2】将两块直角三角板如图1放置,
,
,
,
,
.
________,
________.
(2)现固定
的位置不变,将
沿
方向平移至点E正好落在
上,如图2所示,
与
交于G,作
和
的角平分线交于点H,求
的度数;
(3)现固定
,将
绕点A顺时针旋转至
与直线
首次重合的过程中,当线段
与
的一条边平行时,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684b5f952ac5a3645cf97339d3554e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66b90ffe8c9a93aba917c61007e895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d15e86182df309fd0ffb2e9112c11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5101ab05fce5c1190dc22f7e7887aaa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e6219ce9770e9e048bfe015fb53346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcee5cf673e4e2bf0c60661c9037f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd66005da7b2dff722700167903b69a.png)
(2)现固定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acba637d3414f693b819d30e3d35938d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6771cbdbbefefad25f4b7fe88fdecf65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e788a903eea2fd11781f0a9ce10f3000.png)
(3)现固定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
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【推荐1】问题背景:小强在学习完平行线一节后,想利用平行线的知识证明“三角形的内角和是
”;.如图1,是小强为证明三角形内角和是180°所采取的构图方法:过
的顶点
作
.
请完成:(1)利用小强的构图,说明
的理由;
尝试应用:如图2,直线
与直线
相交于点
,夹角为
,点
在点
右侧,点
在
上方,点
在
点左侧运动,点
在射线
上运动(不与
重合);
请完成:(2)当
时,
平分
,
平分
交直线
于点
,求
的度数;
拓展创新:如图3,点
在线段
上运动(不与
重合),
,
,
,
交
于点
;
请完成:(3)当
为何值时,
不随
的变化而变化,并用含
的代数式表示
的度数(写出解答过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
请完成:(1)利用小强的构图,说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8ee8e3a10ea554320bf3fd3263185d.png)
尝试应用:如图2,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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5df5ea78d1e73cd891ad62f15479b31.png)
请完成:(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852c13de65877be1f43ac1f88f179d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88884321733714de9db5466629ccf2.png)
拓展创新:如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5df5ea78d1e73cd891ad62f15479b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c148d052647a50b5f1cf92b37db30eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb02026d798ff69c17c4afdc1151267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d873405c90a3e9bc1b8f52bcd2852e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
请完成:(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88884321733714de9db5466629ccf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852c13de65877be1f43ac1f88f179d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88884321733714de9db5466629ccf2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/8b527c79-37fe-453e-a404-19290b6b8b2b.png?resizew=372)
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【推荐2】已知直线
,点
在直线
、
之间,点M、N分别在直线
、
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/767e9e29-cee6-4029-8990-14541524c503.png?resizew=510)
(1)如图1,直线
过点
,分别与直线
、
交于点
、
,
,求证:
;
(2)如图2,点F在直线
上,
、
分别平分
、
,若
,求
的度数;
(3)如图3,
平分
,
平分
,
平分
.直线
与
交于点
,
平分
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/767e9e29-cee6-4029-8990-14541524c503.png?resizew=510)
(1)如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ca8c8711e8d5eaf1a8d6a0eda5deb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899624ef8eb282c49079531ac2e4eda9.png)
(2)如图2,点F在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2405fa51f897fac1ca37c301ec3a414f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9886ccd7c5c410280a2c4470344ccefc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfc8ae69efdc1ec529517f1993caa2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502b2e185cf1eede6730577e6924e486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2224bb7e017b4d687e1d4f70ce3cd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb949f2a7ee89566c5c02b75043f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6c8c9bec9cb426ab66f5cdb0c6591d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96d2258ebd411338fa636f7aba84992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4ce00685b7a00415425e18fe108c6e.png)
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解题方法
【推荐3】材料1:反射定律
当入射光线AO照射到平面镜上时,将遵循平面镜反射定律,即反射角(∠BOM)的大小等于入射角(∠AOM)的大小,显然,这两个角的余角也相等,其中法线(OM)与平面镜垂直,并且满足入射光线、反射光线(OB)与法线在同一个平面.
材料2:平行逃逸角
对于某定角∠AOB=α(0°<α<90°),点P为边OB上一点,从点P发出一光线PQ(射线),其角度为∠BPQ=β(0°<β<90°),当光线PQ接触到边OA和OB时会遵循反射定律发生反射,当光线PQ经过n次反射后与边OA或OB平行时,称角为定角α的n阶平行逃逸角,特别地,当光线PQ直接与OA平行时,称角β为定角α的零阶平行逃逸角.
(1)已知∠AOB=α=20°,
①如图1,若PQ∥OA,则∠BPQ= °,即该角为α的零阶平行逃逸角;
②如图2,经过一次反射后的光线P1Q∥OB,此时的∠BPP1为α的平行逃逸角,求∠BPP1的大小;
③若经过两次反射后的光线与OA平行,请补全图形,并直接写出α的二阶平行逃逸角为 °;
(2)根据(1)的结论,归纳猜想对于任意角α(0°<α<90°),其n(n为自然数)阶平行逃逸角β= (用含n和a的代数式表示).
当入射光线AO照射到平面镜上时,将遵循平面镜反射定律,即反射角(∠BOM)的大小等于入射角(∠AOM)的大小,显然,这两个角的余角也相等,其中法线(OM)与平面镜垂直,并且满足入射光线、反射光线(OB)与法线在同一个平面.
材料2:平行逃逸角
对于某定角∠AOB=α(0°<α<90°),点P为边OB上一点,从点P发出一光线PQ(射线),其角度为∠BPQ=β(0°<β<90°),当光线PQ接触到边OA和OB时会遵循反射定律发生反射,当光线PQ经过n次反射后与边OA或OB平行时,称角为定角α的n阶平行逃逸角,特别地,当光线PQ直接与OA平行时,称角β为定角α的零阶平行逃逸角.
(1)已知∠AOB=α=20°,
①如图1,若PQ∥OA,则∠BPQ= °,即该角为α的零阶平行逃逸角;
②如图2,经过一次反射后的光线P1Q∥OB,此时的∠BPP1为α的平行逃逸角,求∠BPP1的大小;
③若经过两次反射后的光线与OA平行,请补全图形,并直接写出α的二阶平行逃逸角为 °;
(2)根据(1)的结论,归纳猜想对于任意角α(0°<α<90°),其n(n为自然数)阶平行逃逸角β= (用含n和a的代数式表示).
![](https://img.xkw.com/dksih/QBM/2018/12/2/2088368778592256/2089767719813120/STEM/2cb29f5f-1700-4648-8eef-7ec71042f3e6.png?resizew=420)
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