求证:相似三角形对应角的角平分线之比等于相似比.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/cba8fc6e-2200-4f91-bee1-8a024bde4329.png?resizew=186)
要求:①分别在给出的相似三角形△ABC与△DEF中用尺规作出一组对应角的平分线,不写作法,保留作图痕迹;
②在完成作图的基础上,写出已知、求证,并加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/cba8fc6e-2200-4f91-bee1-8a024bde4329.png?resizew=186)
要求:①分别在给出的相似三角形△ABC与△DEF中用尺规作出一组对应角的平分线,不写作法,保留作图痕迹;
②在完成作图的基础上,写出已知、求证,并加以证明.
18-19九年级上·福建漳州·期末 查看更多[8]
【市级联考】福建省漳州市2019届九年级上学期期末教学质量抽测数学试题【市级联考】福建省漳州市2019届九年级(上)期末数学试题福建省漳州市漳浦县2018-2019学年九年级上学期期末数学试题福建省泉州市永春五中教研片区2019-2020学年九年级上上学期期中试题湖北恩施沙地中学2019-2020学年九年级上学期月考数学试题(已下线)第12课时 相似三角形的性质(重点练)-2020-2021学年九年级数学上册十分钟同步课堂专练(华师大版)河南省南阳市唐河县2021-2022学年九年级上学期期中数学试题福建省泉州市第六中学2023-2024学年九年级上学期月考数学试题
更新时间:2020-02-28 21:11:56
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解答题-作图题
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【推荐1】如图,四边形ABCD是平行四边形.
![](https://img.xkw.com/dksih/QBM/2022/10/1/3078300476555264/3078897734418432/STEM/0bb8603f3a7849c8bbbb46b83ec4db56.png?resizew=111)
(1)用尺规作图作∠ADC的平分线交AB于E(保留作图痕迹,不要求写作法);
(2)求证:AD=AE.
![](https://img.xkw.com/dksih/QBM/2022/10/1/3078300476555264/3078897734418432/STEM/0bb8603f3a7849c8bbbb46b83ec4db56.png?resizew=111)
(1)用尺规作图作∠ADC的平分线交AB于E(保留作图痕迹,不要求写作法);
(2)求证:AD=AE.
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解答题-作图题
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名校
【推荐2】如图,在
中,
,
,点
为
边的中点,
交
的延长线于点
,连接
.
的平分线交
于点
(不写作图过程,保留作图痕迹);
(2)完成以下证明:
证明:∵
,
,
∴ ① 与
,
∵
是
的平分线,∴
,
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
∴ ②
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e471c5814375a4f67efbd20aea6df0.png)
∴ ③
∵点
为
的中点,∴ ④ ,
在
和
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd434e057e76c0f48f5cc3f9878150d.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60d986f0f2aae1cafaf1fb55b9079fb.png)
∴
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)完成以下证明:
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
∴ ① 与
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∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1629d8f37af864c3cd3541a4a42b4c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
∴ ②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∴
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∴ ③
∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd434e057e76c0f48f5cc3f9878150d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60d986f0f2aae1cafaf1fb55b9079fb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
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解答题-证明题
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【推荐1】如图,在正方形
中,E是边
上的点,点F在边
上,且
,
.
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;
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,延长
交
的延长线于点G,求
的长.
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(1)求证:
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(2)若
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解答题-证明题
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【推荐2】如图,在
中,
,
平分
交
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,作
交
于点
,
是
的外接圆.
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是
的切线;
(2)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)已知
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