名校
1 . 如图1,已知
和
均为等腰直角三角形,点D、E分别在线段
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/36c82f2c-be3f-4e17-9e8a-a277fa2a3214.png?resizew=349)
(1)【观察猜想】
将
绕点A逆时针旋转,连接
,如图2,当
的延长线恰好经过点E时:
的值为________;
的度数为___________度;
(2)【类比探究】
如图3,继续旋转
,连接
,
,设
的延长线交
于点F,请求出
的值以及
的度数;
(3)拓展延伸:若
,
,当C、A、D三点在同一直线上时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee9ce4563b7e07c014769075b1edd76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/36c82f2c-be3f-4e17-9e8a-a277fa2a3214.png?resizew=349)
(1)【观察猜想】
将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a03841966d8142fa4a4aed023e37931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
(2)【类比探究】
如图3,继续旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e6292216592a5eba3293a85bbdb3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30f9b7a6123f13fa0793ead76dc651a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
2022-10-23更新
|
179次组卷
|
2卷引用:河北省保定市第十七中学教育集团九年级2022-2023学年九年级上学期期中阶段反馈数学试卷
真题
名校
2 . 问题背景:
如图1,在矩形
中,
,
,点
是边
的中点,过点
作
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/6f13ba8a-e495-45eb-a1a4-faabce8b7aaf.png?resizew=630)
实验探究:
(1)在一次数学活动中,小王同学将图1中的
绕点
按逆时针方向旋转
,如图2所示,得到结论:①
_____;②直线
与
所夹锐角的度数为______.
(2)小王同学继续将
绕点
按逆时针方向旋转,旋转至如图3所示位置.请问探究(1)中的结论是否仍然成立?并说明理由.
拓展延伸:
在以上探究中,当
旋转至
、
、
三点共线时,则
的面积为______.
如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/6f13ba8a-e495-45eb-a1a4-faabce8b7aaf.png?resizew=630)
实验探究:
(1)在一次数学活动中,小王同学将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b82511bc8d7d9e419e58b909d4e730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)小王同学继续将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
拓展延伸:
在以上探究中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
您最近一年使用:0次
2021-09-09更新
|
3793次组卷
|
21卷引用:2022年河北省邢台市新河县中考二模数学试题
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名校
解题方法
3 . 操作与探究,如图1,将等腰直角三角形
的
边绕点
顺时针旋转
得到线段
,
,
,连接
,过点
做
交
延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/be37a114-185c-4be5-ba95-a8ec85fb7b15.png?resizew=196)
(1)在图1中,易知
与
全等,则
的面积为______,
______;
拓展与延伸
(2)如图2,若
为任意直角三角形,
,
、
、
分别用
、
、
表示.将
边绕点
顺时针旋转
,得到
,过点
作
,交
延长线于点
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/fba9342b-13fe-4484-9299-df19f25fb992.png?resizew=198)
①判断
与
是否全等,并说明理由;
②求
的值;(用
,
,
表示)
(3)如图3,在
中,
,
,
,
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4b4c316-0b60-44ae-8adc-e22492c0a0bb.png?resizew=210)
①
的面积为______;
②点
是
边的高上的一点,当
______时,
有最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e13b639fd46e6a29ed193b9b035785e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/be37a114-185c-4be5-ba95-a8ec85fb7b15.png?resizew=196)
(1)在图1中,易知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3224c2b3d4030a695c7ce3e615b7366.png)
拓展与延伸
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04981d37985114ba0233b0ba0e8a3add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/fba9342b-13fe-4484-9299-df19f25fb992.png?resizew=198)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b866a7fef76300c516d4651e85bedb7.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f827132afc266c3aa4896dbe618be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e06ba7dd49252ed56e99b20af3bc74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec577daa119b13413aafbd667f8922be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4b4c316-0b60-44ae-8adc-e22492c0a0bb.png?resizew=210)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9afd460d7f037a24d23542a9288ab35.png)
您最近一年使用:0次
4 . 动手操作
利用旋转开展数学活动,探究图形变换中蕴含的敌学思想方法.
如图1,将等腰直角三角形ABC的AB边绕点B顺时针旋转90得到线段A′B,∠ACB=90°,AC=1,连接A′C,过点A′做A′H⊥CB交CB延长线于点H.
思考探索
(1)在图1中:易知△ABC与△A′BH全等.
①△A′BC的面积为 ;
②sin∠A′BH= ;
拓展延伸
(2)如图2.若△ABC为任意直角三角形,∠ACB=90°,BC、AC、AB分别用a、b、c表示AB边绕点B顺时针旋转90°,得到A′B,过点A′作A′H′⊥BC,交BC延长线于点H′;
①△ABC与△A′BH′全等吗?并说明理由:
②sin∠A′BH′= (用a,b,c表示)
(3)如图3,在△ABC,AB=AC,AB⊥A′B,AB=10,BC=12,A′B=5,连接A′C
①△ABC的面积为
②点D是BC边的高上的一点,当AD= 时,A′D+DB有最小值
利用旋转开展数学活动,探究图形变换中蕴含的敌学思想方法.
如图1,将等腰直角三角形ABC的AB边绕点B顺时针旋转90得到线段A′B,∠ACB=90°,AC=1,连接A′C,过点A′做A′H⊥CB交CB延长线于点H.
思考探索
(1)在图1中:易知△ABC与△A′BH全等.
①△A′BC的面积为 ;
②sin∠A′BH= ;
拓展延伸
(2)如图2.若△ABC为任意直角三角形,∠ACB=90°,BC、AC、AB分别用a、b、c表示AB边绕点B顺时针旋转90°,得到A′B,过点A′作A′H′⊥BC,交BC延长线于点H′;
①△ABC与△A′BH′全等吗?并说明理由:
②sin∠A′BH′= (用a,b,c表示)
(3)如图3,在△ABC,AB=AC,AB⊥A′B,AB=10,BC=12,A′B=5,连接A′C
①△ABC的面积为
②点D是BC边的高上的一点,当AD= 时,A′D+DB有最小值
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930522276708352/2946680619556864/STEM/4d6d2b49-eb14-4d80-b94b-99bc8937442f.png?resizew=566)
您最近一年使用:0次
解题方法
5 . 如图1,在△ABC中,AB=AC=2,∠BAC=120°,点D、E分别是AC、BC的中点,连接DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/d9c5db40-b382-468b-9fe2-a305853cb1f6.png?resizew=400)
(1)探索发现:
图1中,
的值为 ,
的值为 .
(2)拓展探究
若将△CDE绕点C旋转,在旋转过程中
的大小有无变化?请仅就图2的情形给出证明.
(3)问题解决
当△CDE旋转至A,D,C三点共线时,直接写出线段BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/d9c5db40-b382-468b-9fe2-a305853cb1f6.png?resizew=400)
(1)探索发现:
图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274ae3f70122c99addb6df12405bac91.png)
(2)拓展探究
若将△CDE绕点C旋转,在旋转过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274ae3f70122c99addb6df12405bac91.png)
(3)问题解决
当△CDE旋转至A,D,C三点共线时,直接写出线段BE的长.
您最近一年使用:0次
2022-01-11更新
|
153次组卷
|
6卷引用:河北省衡水市第六中学2022-2023学年九年级上学期期中考试数学试卷
6 . 如图1,在
中,
,点
分别是边
的中点,连接
.将
绕点
逆时针方向旋转,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/e49c4ed8-a173-47cf-ade4-1ae8dc67eab8.png?resizew=196)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/5814ccbb-bd52-4405-922f-d4f6a7fc45ae.png?resizew=191)
(1)问题发现
①当
时,
____________;②当
时,
___________.
(2)拓展探究试判断:当
时,
的大小有无变化?请仅就图2的情形给出证明.
(3)问题解决
绕点
逆时针旋转至
三点在同一条直线上时,直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7069998d614205c026f617341aa68777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887721a843b2dc8e947cc42d09868e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/e49c4ed8-a173-47cf-ade4-1ae8dc67eab8.png?resizew=196)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/38138f3f-f251-42bf-8705-0078b0059a9c.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/5814ccbb-bd52-4405-922f-d4f6a7fc45ae.png?resizew=191)
(1)问题发现
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1324ff7173a4cfdf94521785f83f2c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce24b781c66474602b5ba6627241531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0aea70d7674adbcfb6c150aa014c884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce24b781c66474602b5ba6627241531.png)
(2)拓展探究试判断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1ff4548a51c31a2439567fb8b5f27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625000a942ec1b76a1176284be6d6520.png)
(3)问题解决
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00045940432a531a8f07034032d9248d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
7 . (1)问题发现
如图1,在Rt△ABC和Rt△DBE中,∠ABC=∠DBE=90°,∠ACB=∠BED=45°,点E是线段AC上一动点,连接DE.
填空:①则
的值为______;②∠EAD的度数为_______.
(2)类比探究
如图2,在Rt△ABC和Rt△DBE中,∠ABC=∠DBE=90°,∠ACB=∠BED=60°,点E是线段AC上一动点,连接DE.请求出
的值及∠EAD的度数;
(3)拓展延伸
如图3,在(2)的条件下,取线段DE的中点M,连接AM、BM,若BC=4,则当△ABM是直角三角形时,求线段AD的长.
如图1,在Rt△ABC和Rt△DBE中,∠ABC=∠DBE=90°,∠ACB=∠BED=45°,点E是线段AC上一动点,连接DE.
填空:①则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8c29d5a9671a6f715b486d10366b48.png)
(2)类比探究
如图2,在Rt△ABC和Rt△DBE中,∠ABC=∠DBE=90°,∠ACB=∠BED=60°,点E是线段AC上一动点,连接DE.请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8c29d5a9671a6f715b486d10366b48.png)
(3)拓展延伸
如图3,在(2)的条件下,取线段DE的中点M,连接AM、BM,若BC=4,则当△ABM是直角三角形时,求线段AD的长.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2481089448271872/2481816076206080/STEM/f241a61bd61647e79c8527f6da5a5834.png?resizew=491)
您最近一年使用:0次
2020-06-10更新
|
145次组卷
|
2卷引用:河北省衡水市武邑县赵桥中学2022-2023学年九年级下学期期中数学试卷题
名校
解题方法
8 . 几何探究:
【问题发现】
(1)如图1所示,△ABC和△ADE是有公共顶点的等边三角形,BD、CE的关系是_______(选填“相等”或“不相等”);(请直接写出答案)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/ea3f6fd1-25ed-437c-a5b9-390a8e66ff75.png?resizew=265)
【类比探究】
(2)如图2所示,△ABC和△ADE是有公共顶点的含有
角的直角三角形,(1)中的结论还成立吗?请说明理由;
【拓展延伸】
(3)如图3所示,△ADE和△ABC是有公共顶点且相似比为1 : 2的两个等腰直角三角形,将△ADE绕点A自由旋转,若
,当B、D、E三点共线时,直接写出BD的长.
【问题发现】
(1)如图1所示,△ABC和△ADE是有公共顶点的等边三角形,BD、CE的关系是_______(选填“相等”或“不相等”);(请直接写出答案)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/ea3f6fd1-25ed-437c-a5b9-390a8e66ff75.png?resizew=265)
【类比探究】
(2)如图2所示,△ABC和△ADE是有公共顶点的含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
【拓展延伸】
(3)如图3所示,△ADE和△ABC是有公共顶点且相似比为1 : 2的两个等腰直角三角形,将△ADE绕点A自由旋转,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
您最近一年使用:0次
2020-07-03更新
|
850次组卷
|
4卷引用:2022年河北省中考模拟数学试题
9 . (1)问题发现
如图1,在
中,
,
,点
在线段
上运动(不与点
重合),连接
,将线段
绕点
逆时针旋转90°,得到
,连接
.填空:线段
和
的数量关系为______,位置关系为______;
(2)探究证明
如图2,在(1)的条件下,若点
在线段
的延长线上运动,请你判断(1)中的结论是否仍然成立,并说明理由;
(3)拓展延伸
如图3,在锐角
中,
,
,
,若点
在线段
上运动,连接
,将线段
绕点
逆时针旋转90°,得到
,连接
,过点
作
交
于点
.请求出线段
取得最大值时
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/cd411762-1ed8-4e67-8c95-21a059346e6f.png?resizew=350)
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)探究证明
如图2,在(1)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)拓展延伸
如图3,在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6eab933fd3ed8a3a412a6f268d4cef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e562c0e421b6a46d502a5cf81bdce731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
您最近一年使用:0次
解题方法
10 . 如图1,在平面直角坐标系中,四边形
是矩形,点
,
的坐标分别为
,
.点
是线段
上的一个动点(点
与点
,
不重合),直线
过点
并与折线
交于点
,设
的面积为
,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/84fbef86-34cf-4c49-a9f4-6639d645702a.png?resizew=355)
探究:(1)当直线
过点
时,
的值是________;
延伸:(2)如图2,当点
在线段
上时,矩形
关于直线
对称的图形为矩形
,线段
与线段
交于点
,线段
与线段
交于点
,得到菱形
.
直接写出:菱形
面积的最大值是:________,此时
________;
拓展:(3)在点
运动的过程中,①直接写出
与
的函数关系式;
②当
________时,(2)中菱形
的面积与
相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/252e377f8bf75bc6fd986758873054a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b5e1433d7c2ad6a5b2de8a557a43d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ceee289a7affa4bf09083df915dfb28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/84fbef86-34cf-4c49-a9f4-6639d645702a.png?resizew=355)
探究:(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
延伸:(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352529b508315e10a9a078898c2ae8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a7bdf7e08e931ba7df81d0e88c43596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b584cac35c71a70d09b03119d3859a94.png)
直接写出:菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b584cac35c71a70d09b03119d3859a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
拓展:(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b584cac35c71a70d09b03119d3859a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
您最近一年使用:0次