如图,
,点
在
边上,点
,
在
边上,连接
,
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c211a24e544ded208ea0a2a2aa59bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac9ec83229f9e5219432a774d7527cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/4fb5a342-2dbc-497e-be66-55c422f38506.png?resizew=193)
21-22八年级下·陕西西安·期中 查看更多[5]
陕西省西安市高陵区2021-2022学年八年级下学期期中数学试题江西省吉安市永丰县2021-2022学年八年级下学期期中数学试题(已下线)2.5 等腰三角形的轴对称性(培优分阶练)-2022-2023学年八年级数学上册课后培优分级练(苏科版)江西省吉安市永丰县部分学校2021-2022学年下学期八年级期中数学试卷 (已下线)第13章 轴对称(基础、常考、易错、压轴)分类专项训练-2022-2023学年八年级数学考试满分全攻略(人教版)
更新时间:2022-08-05 15:42:13
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解答题-问答题
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【推荐1】问题情境:如图1,在同一平面内,点
和点
分别位于一块直角三角板
的两条直角边
上,点
和点
在直线
的同侧.若点
在内部
,则
的大小是否发生变化?
(1)问题解决:若
,则
___________,
___________,
___________.
(2)类比探究:如图2,在(1)的条件下,改变(1)中三角板
的位置.使三角板
的两条直角边
仍然分别经过点
,则(1)中
的大小是否发生变化?若变化,请求出
的度数;若不变化,请说明理由.
(3)类比延伸:将(1)中“
”改成“
”,其他条件不变.请直接写出
的度数(用含
的式子表示).
![](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/ef66d65f90d1885d0bf2454d094a50b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9177967c585651c715a7fd9a90d16c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fde166eb8fe559975f88ef7a3fcc76f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fd73946f2a36ecc5591c27b4c3e355.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/29/4db30c74-f04d-43ca-bb48-d8c548a1e832.png?resizew=351)
(1)问题解决:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da224b15dcd3f2271afc0b793a16b1b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5690510a445d2af7b5808bcdcdaaecdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc7614ffc0297ba6c29f26f72f1805e.png)
(2)类比探究:如图2,在(1)的条件下,改变(1)中三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef66d65f90d1885d0bf2454d094a50b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef66d65f90d1885d0bf2454d094a50b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9177967c585651c715a7fd9a90d16c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fde166eb8fe559975f88ef7a3fcc76f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fd73946f2a36ecc5591c27b4c3e355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fd73946f2a36ecc5591c27b4c3e355.png)
(3)类比延伸:将(1)中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fd73946f2a36ecc5591c27b4c3e355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-证明题
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【推荐2】已知,如图,在
与
中,
,
,求证:
.(补充完整下面的证明过程.)
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757880884183040/2822342741065728/STEM/676b01d6-c546-42fe-8a97-c3b6c9eca751.png)
证明:在
中,
,(理由:_________________________________)
,(理由:__________________________________)
在
中,
,
,
,
,
_______________________,
.(理由:______________________________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de59390a7059cfdea1f42ce1ffac70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25cbc3b1ec78b994a90cee8714a1d9c.png)
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757880884183040/2822342741065728/STEM/676b01d6-c546-42fe-8a97-c3b6c9eca751.png)
证明:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ece0daf94b11028c480357be50df19b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d942c20297ce26052262f49cff899d36.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0978aad7e9497a7a217405b0bde7b4f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e417c9dd2be97357f0f2c0d1ca2d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2e16fe202ace573a17161d1b8e2212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79de59390a7059cfdea1f42ce1ffac70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
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名校
【推荐1】如图,
是⊙O的直径,C为⊙O上一点,连接
,
.
平分
,点D在⊙O上,连接
,交
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/cf20bfa0-8b07-492f-b10f-d932fd842412.png?resizew=151)
(1)若
,
,求
的长;
(2)求证:
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/cf20bfa0-8b07-492f-b10f-d932fd842412.png?resizew=151)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099583a660c8ce79be1698d534db6f7c.png)
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【推荐2】如图,
为
的直径,
是
的切线,C为切点,交
的延长线于D,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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