如图,等腰
的顶角
.请用尺规作图法,在
上求作一点
,使得
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbd19c4ce8c78b82caa79a04135cbd8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/8b786643-ae03-43e7-b62c-3da8e18a0a78.png?resizew=117)
20-21九年级·全国·假期作业 查看更多[4]
(已下线)练习09 作图—相似变换-2020-2021学年【补习教材·寒假作业】九年级数学(沪科版)陕西省西安市2022-2023学年九年级上学期数学期末考试陕西省铜川市王益区铜川市第二中学2021-2022学年九年级上学期期末数学试题2024年陕西省西安市雁塔区高新一中中考五模数学试题
更新时间:2021-01-12 22:05:30
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解答题-作图题
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【推荐1】阅读下列材料,完成任务:
任务:
(1)方法1用到了三角形全等的判定方法,该方法是______(填写序号).
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
(2)针对方法2的操作过程,请用两种方法 证明
是
的平分线.
×年×月×日 作角平分线的两种方法 今天,我在书店看到下面一段材料: 木工师傅有一块木板,木板上画有 ![]() ![]() ![]() 方法1:如图1,在射线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 方法2:如图2,用刻度尺在 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 我的思考:方法1和方法2能通过证明得到吗? |
(1)方法1用到了三角形全等的判定方法,该方法是______(填写序号).
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4351a730f61bb998bab8f0b7848912d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
(2)针对方法2的操作过程,请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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【推荐2】如图,在
中,
(1)
是
的外角
的平分线,且交
的延长线于点
(依题意补出图形).
(2)
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/41b87016-b36d-4b84-a87d-e947ca6f5c62.png?resizew=163)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc9c9a1c828f5b3c718e2a98a749192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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【推荐3】数学课上,探讨角平分线的作法时,李老师用直尺和圆规作角平分线,方法如下:
根据以下情境,解决下列问题:
(1)李老师用尺规作角平分线时,用到的三角形全等的判定方法是______.
小聪只带了直角三角板,他发现利用三角板也可以作角平分线,方法如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/732af03c-40a8-4569-962d-5238881c8ba3.png?resizew=205)
步骤:①利用三角板上的刻度,在
和
上分别截取
、
,使
.
②分别过
、
作
、
的垂线,交于点
.
③作射线
.则
为
的平分线.
(2)小聪的作法正确吗?请说明理由.
根据以下情境,解决下列问题:
作法:①在 ![]() ![]() ![]() ![]() ![]() ②分别以 ![]() ![]() ![]() ![]() ![]() ③作射线 ![]() ![]() ![]() |
小聪只带了直角三角板,他发现利用三角板也可以作角平分线,方法如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/732af03c-40a8-4569-962d-5238881c8ba3.png?resizew=205)
步骤:①利用三角板上的刻度,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
②分别过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
③作射线
![](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/6d7b2fe01a33c4825f9974ed9663a99c.png)
(2)小聪的作法正确吗?请说明理由.
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【推荐1】如图,AB⊥BD,CD⊥BD,AB=12,CD=8,BD=28,点P在BD上移动,当以P,C,D为顶点的三角形与△ABP相似时,求PB的长.
![](https://img.xkw.com/dksih/QBM/2021/10/14/2828951944044544/2829750497165312/STEM/c756d794-22bb-4b09-b6eb-a98f42240b29.png)
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解答题-作图题
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【推荐2】如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点.
的三个顶点都是格点.仅用无刻度的直尺在给定网格中完成画图.
上,先将
沿
方向平移,使点B与点C重合,画出平移后的线段
,再在射线
上画点F,使
;
(2)在图2中,先在
上画点G,使
,再将
绕点A逆时针旋转
至
,在
上画点Q,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1726bef4a3ff4bc418a64732a8c7c81.png)
(2)在图2中,先在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b993edba1f1d9b0b27cbf23588d0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d338e4a9f1c2fc22b913ed84bfb3e637.png)
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