1 . 如图,已知
,
.求证:
.
(已知),
( ),
∴
( ).
又∵ (已知),
∴
(平角的定义).
∴
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a73922a893a574a434a19845461a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54eb639802989aa4b8e541734ec00f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a73922a893a574a434a19845461a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f105c0ed8d428f8933398814f69ead7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5055139aa05bf66967f16ec82dc74057.png)
又∵ (已知),
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d67aa2a39c15abaa0cbc09432f1fb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
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名校
2 . 请把下列的证明过程补充完整:
已知:如图,
,
,求证:
,
与
是对顶角,
∴
( ① )
又∵
(已知).
∴
,
∴
( ② )
∴
( ③ ).
∵
(已知),
∴
( ④ ),
∴
( ⑤ )
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53056492d98a3333ab688e3e1abc45d1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2551d99e91a12eb8d45c976f714e8f.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9b268cddd4eb888231ddefc47a6462.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4fa20985b4439a46ab378eb049f8e4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f578ea8f3cde97c11316f07c75aa2b76.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e8279defd3c7ad239c0ac1e3bf02c8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
您最近一年使用:0次
2023-05-07更新
|
221次组卷
|
4卷引用:山东省东营市河口区胜利第六十二中学2023-2024学年六年级下学期期中数学试题
3 . 完成下面推理过程.
如图,
于F,
于E,
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a32ff42fed45ae870a688fb7103fa72.png)
证明:∵
,
(已知)
∴
(垂直的定义)
∴
( )
∴
( )
∵
(已知)
又∵
(平角的定义)
∴
( )
∴
( )
∴
( )
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825cb0098660793178b69790de35f5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a32ff42fed45ae870a688fb7103fa72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/9ddf6278-10bd-41fc-9b98-d6d1e9d0ee44.png?resizew=182)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc051f5bd7ca13c4d3f9c87fa287c0e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0b121b822e709327e7ddf1b58fad75.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825cb0098660793178b69790de35f5f2.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff16532180209a16c02e73cbeb7c210c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494ba20b1444f524cf636961e4688ae8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a32ff42fed45ae870a688fb7103fa72.png)
您最近一年使用:0次
2023-07-23更新
|
167次组卷
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3卷引用:第七章 相交线与平行线 7.3平行线的性质
名校
4 . 如图,
中,
, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2457c9087070840f4a2ec177cbb676f8.png)
(1)尺规作图:作
边的垂直平分线
交
于点
,交
于点
.(保留作图痕迹,不要求写作法和证明);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef14126f9e6feefa2743f73557aedb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2457c9087070840f4a2ec177cbb676f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/b7d119b4-8a8f-44be-b63f-bd941df44573.png?resizew=146)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681b593dba5d76f3de43e8dd41a13fc8.png)
您最近一年使用:0次
2023-08-19更新
|
112次组卷
|
6卷引用:广东省湛江市雷州市八校联考2023-2024学年六年级上学期期中数学试题
5 . 如图1,四边形
内接于
,
,过D作
交
延长线于点E
(1)若
为直径,证明:
是
的切线;
(2)若
不是
的直径,如图2,
交
于点F,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①求证:
;
②若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/f3ec42b2-4f0b-4af2-9b72-6c626fdc6652.png?resizew=297)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec1b3b373c2c344be9d5163d62c1cfe.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510a4dbea30e63470ecabe22f329791b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a9b5b1f9c7f411de6e92010d76de26.png)
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名校
6 . 【感知】如图①,
,点E在直线
上,点F在直线
上,点P为
,
之间一点,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/474eb5e1-6cb6-4c8d-8756-69c47dc668ef.png?resizew=388)
小明想到以下的方法,请你帮忙完成推理过程.
证明:如图①,过点P作
.
∵
(已知),
∴
(平行与同一条直线的两条直线平行),
∴
________,
∴
(等式性质),
∴
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/0a773821-f10e-4c63-be47-6e03bed8ebc8.png?resizew=390)
(1)【应用】小明同学进行了更进一步的思考:利用【感知】中的结论进行证明如图②,直线
,点A,C在直线a上,点B,D在直线b上,直线
,
分别平分
,且交于点E.猜想并证明
与
的数量关系.
(2)【拓展】如图③,
,直线
与
分别交于点M,N,点P在
上,点G在
上,
,若动点E在线段
上移动(不与M,G,N重合),连接PE,
和
的平分线交于点H,补全图形,请直接写出
与
的数量关系.
(3)在(1)的条件下,若直线
的位置如图④所示,请直接写出
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.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://staticzujuan.xkw.com/quesimg/Upload/formula/07fc0c630351b2123770e0a48d9a72f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/474eb5e1-6cb6-4c8d-8756-69c47dc668ef.png?resizew=388)
小明想到以下的方法,请你帮忙完成推理过程.
证明:如图①,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608c1bf321aefaca5094d36f653d59ea.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c705a37c261c9228ba58c15af53e362a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f5e47d8721630eef9f79402e1defeb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac4e744c5e0a09e43daebe9cd828dad.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fc0c630351b2123770e0a48d9a72f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/0a773821-f10e-4c63-be47-6e03bed8ebc8.png?resizew=390)
(1)【应用】小明同学进行了更进一步的思考:利用【感知】中的结论进行证明如图②,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc121bd98f83fd45c787465f74df7ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
(2)【拓展】如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054219d9dd4db0224d09634dd6302811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7098c45594103b46e6b57cfc6023e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9bebe23a3e351436edec2f6b4312fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61570b06b7641ac8b6a69bc3c72db2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460893f14dc72e6a6e3db81d754c4f57.png)
(3)在(1)的条件下,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61570b06b7641ac8b6a69bc3c72db2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460893f14dc72e6a6e3db81d754c4f57.png)
您最近一年使用:0次
2023-04-21更新
|
579次组卷
|
4卷引用:鲁教版六年级下册第七章相交线与平行线单元测试数学试题
鲁教版六年级下册第七章相交线与平行线单元测试数学试题江苏省南京市玄武区四校联考2022-2023学年七年级下学期期中数学试题江苏省南京市玄武区2022-2023学年七年级下学期期中数学试题(已下线)专题7.37 平面图形的认识(二)中的动点问题(分层练习)(培优练)-2023-2024学年七年级数学下册基础知识专项突破讲与练(苏科版)
7 . 完成下面证明,并注明理由
已知:∠1=∠E,∠B=∠D
求证:AB∥CD
证明:∵∠1=∠E
∴________∥ __________( )
∴∠D+∠2=180°( )
∵∠B=∠D
∴∠ __________ + ∠ __________=180°
∴AB∥CD( )
已知:∠1=∠E,∠B=∠D
求证:AB∥CD
证明:∵∠1=∠E
∴________∥ __________( )
∴∠D+∠2=180°( )
∵∠B=∠D
∴∠ __________ + ∠ __________=180°
∴AB∥CD( )
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953059207790592/2953620057546752/STEM/0138542a-f783-4194-a1de-988b9ce60308.png?resizew=194)
您最近一年使用:0次
2018九年级·全国·专题练习
8 . 用三种方法证明“三角形的外角和等于360°”.
求证:∠BAE+∠ CBF+∠ACD =360°.
证法1∵ ① .
∴∠BAE+∠1+∠CBF+∠2+∠ACD+∠3=180°× 3=540°.
∴∠BAE+∠CBF+∠ACD =540°-∠1-∠2 -∠3=540°-(∠1+∠2 +∠3) .
∵ ② .
∴∠BAE+∠CBF+∠ACD =540°-180°= 360°.
请把证法1补充完整,并继续用两种不同的方法完成证明.
求证:∠BAE+∠ CBF+∠ACD =360°.
证法1∵ ① .
∴∠BAE+∠1+∠CBF+∠2+∠ACD+∠3=180°× 3=540°.
∴∠BAE+∠CBF+∠ACD =540°-∠1-∠2 -∠3=540°-(∠1+∠2 +∠3) .
∵ ② .
∴∠BAE+∠CBF+∠ACD =540°-180°= 360°.
请把证法1补充完整,并继续用两种不同的方法完成证明.
您最近一年使用:0次
2022-06-24更新
|
90次组卷
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19卷引用:人教版(五四制)六年级数学下册 第9章 几何图形初步 单元测试卷
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名校
9 . 请将下列题目中横线上的证明过程和依据补充完整:
如图,点
在
上,AG
CD,
平分
,
,
于点
.求证:
.
证明:
AG
CD,
( )
,
,
即
,
平分
,
( )
.
∴BC
CF( )
.
,
( ).
.
如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b461231953095b53fee54392228766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f033eb202f5330181d2f5c33dbc6904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68be1ce082f499364ae5cfbdd96b9812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8c1868c845a53a0f23353ad02f74b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccb6a4e69186a124328189032c2b2e2.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d7f91da6050477ded2d91b8c44fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c81a268f704e0bd10096409e890872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f11e1d2dd196284dd8d6733c622746.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e62628cbc538f7874d74da5dfd3cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb85f16ecc7e3766ae31816473eadb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a414f0c73a143f2e7228b3ebb58bafe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af3c127a92929909f2b3d7d7937f6ce.png)
∴BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6dce8983725ddaeccb32b434ff5bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376dd7ebc13c00759b4b5da9609d1ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc8816476029a91aef9ed6ad15a0624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2d448e489fb806d3afd84ac600f376.png)
![](https://img.xkw.com/dksih/QBM/2022/2/8/2911852062842880/2937342640504832/STEM/626783d9-eb70-4688-a4b0-07bdd6a9485d.png?resizew=263)
您最近一年使用:0次
2022-03-16更新
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492次组卷
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8卷引用:山东省淄博市沂源县2021-2022学年六年级下学期期末数学试题
名校
10 . 完成下面的证明过程.
已知:如图,点E、F分别在AB、CD上,AD分别交EC、BF于点H、G,∠1=∠2,∠B=∠C.求证∠A=∠D.
∠2=∠AGB( ),
∴∠1= .
∴EC∥BF( ).
∴∠B=∠AEC( ).
又∵∠B=∠C(已知),
∴∠AEC= .
∴ ( ).
∴∠A=∠D( ).
已知:如图,点E、F分别在AB、CD上,AD分别交EC、BF于点H、G,∠1=∠2,∠B=∠C.求证∠A=∠D.
∠2=∠AGB( ),
∴∠1= .
∴EC∥BF( ).
∴∠B=∠AEC( ).
又∵∠B=∠C(已知),
∴∠AEC= .
∴ ( ).
∴∠A=∠D( ).
您最近一年使用:0次
2020-07-20更新
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742次组卷
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