名校
1 . 在学习正方形的过程中,小明发现一个规律:在正方形
中,E为
上任意一点,连接
,若过点A的直线
,交
于点G,则必有
.为了验证此规律的正确性,小明的思路是:先利用下图,过点A作出
的垂线,再通过证全等得出结论.请根据小明的思路完成以下作图与填空:
,交
于点F,交
于点G.(只保留作图痕迹)
(2)证明:∵四边形
是正方形
∴ ①
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19db92d3afe52392ad8f98e2c6c9465b.png)
∴ ②
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28c473b40b3cf82757682b7fb71486c.png)
∴
,
∴ ③
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40f7b34b52942c94fb8a80c85e06b47.png)
∴
( ⑥ )
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdc5e36a59ce2f0c2208126033b4954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9feca8d384d09b47e5be73219658df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴ ①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19db92d3afe52392ad8f98e2c6c9465b.png)
∴ ②
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28c473b40b3cf82757682b7fb71486c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf45ef0a298fff057613c1589e8a67e.png)
∴ ③
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40f7b34b52942c94fb8a80c85e06b47.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17ac76ef4e5e588c6eaae1978f14adc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9feca8d384d09b47e5be73219658df.png)
您最近一年使用:0次
2023-08-23更新
|
266次组卷
|
2卷引用:重庆市西南大学附属中学2022-2023学年九年级下学期期中数学试题
名校
2 . 【阅读材料】小高同学发现这样一个规律:两个顶角相等的等腰三角形,如果具有公共的顶点的顶点,并把它们的底角顶点连接起来则形成一组全等的三角形,小高把具有这个规律的图形称为“手拉手”图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/0c4228fb-3419-4c8c-aeba-19e77c73beb6.png?resizew=576)
【材料理解】
(1)如图1,在“手拉手”图形中,小高发现若
,
,
,则
,请证明小高的发现.
【深入探究】
(2)如图2,
,
,
,试探索线段
,
,
之间满足的等量关系,并证明结论;
【延伸应用】
(3)①如图3,在四边形
中,
,
,
,
与
的数量关系为:________(直接写出答案,不需要说明理由);
②如图4,在四边形
中,
,若
,
,则
的长为________(直接写出答案,不需要说明理由).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/0c4228fb-3419-4c8c-aeba-19e77c73beb6.png?resizew=576)
【材料理解】
(1)如图1,在“手拉手”图形中,小高发现若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
【深入探究】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【延伸应用】
(3)①如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2edd7dbb895fa95a022eb02bbe89d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
②如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2894a6ff5b198184fffcaa1d03a33227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2023-01-09更新
|
497次组卷
|
3卷引用:山东省淄博市张店区张店区第九中学2022-2023学年九年级下学期期中数学试题
3 . 在
中,
,
,直线经过点A,过点
、
分别作
的垂线,垂足分别为点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/fe17519b-fcaf-4c3f-92b4-a411eb66593c.png?resizew=512)
(1)特例体验:如图①,若直线
,
,分别求出线段
、
和
的长;
(2)规律探究:
(Ⅰ)如图②,若直线
从图①状态开始绕点A旋转
,请探究线段
、
和
的数量关系并说明理由;
(Ⅱ)如图③,若直线
从图①状态开始绕点A顺时针旋转
,与线段
相交于点
,请再探究线段
、
和
的数量关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/fe17519b-fcaf-4c3f-92b4-a411eb66593c.png?resizew=512)
(1)特例体验:如图①,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a1eb9d682e2bd181f3b0f5115160b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e486a1aad96167ff62f6fb5136e0bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)规律探究:
(Ⅰ)如图②,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447bdb83bb93996f9acb0c2abc4b6b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(Ⅱ)如图③,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64c7e12b934f2c641ac44f1c9957b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
2022-11-21更新
|
76次组卷
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2卷引用:江西省赣州市章贡区2022-2023学年九年级上学期期中考试数学试题