在平面直角坐标系xOy中,⊙O的半径为1,A,B为⊙O外两点,AB
.给出如下定义:平移线段AB,得到⊙O的弦A′B′(A′,B′分别为点A,B的对应点),线段AA′长度的最小值称为线段AB到⊙O的“平移距离”.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882154234576896/2946682261553152/STEM/a387100c-a261-4da7-be10-850d3778cf5a.png?resizew=488)
(1)如图,平移线段AB得到⊙O的长度为
的弦P1P2和P3P4,则这两条弦的位置关系是 ;在点P1,P2,P3,P4中,连接点A与点 的线段的长度等于线段AB到⊙O的“平移距离”;
(2)若点A在直线y=x+2上;
①若点B也在直线y=x+2上,记线段AB到⊙O的“平移距离”为d1,求d1的最小值;
②若点B在抛物线y=x2+4上且AB∥y轴,是否存在这样的点B满足题意,若存在,求出“平移距离”为d2的最小值,若不存在,说明理由;
(3)若点A的坐标为(2
,2),记线段AB到⊙O的“平移距离”为d3,则d3的取值范围为 ,当d3取最小值时点B的坐标为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada26e9b7fe22be819d675f72e086ee.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882154234576896/2946682261553152/STEM/a387100c-a261-4da7-be10-850d3778cf5a.png?resizew=488)
(1)如图,平移线段AB得到⊙O的长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)若点A在直线y=x+2上;
①若点B也在直线y=x+2上,记线段AB到⊙O的“平移距离”为d1,求d1的最小值;
②若点B在抛物线y=x2+4上且AB∥y轴,是否存在这样的点B满足题意,若存在,求出“平移距离”为d2的最小值,若不存在,说明理由;
(3)若点A的坐标为(2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
20-21九年级上·浙江宁波·期末 查看更多[3]
浙江省宁波市各地区2020-2021学年九年级上学期数学期末大题难题汇编浙江省绍兴市诸暨市暨阳初中教育共同体2021-2022学年九年级上学期期中数学试题(已下线)期中难点特训(一)与圆有关的压轴题-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(浙教版)
更新时间:2022-03-29 15:03:19
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【推荐1】如图,在平面直角坐标系中,四边形
是菱形,点
的坐标为
,点
在
轴的正半轴上,
为坐标原点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/91b791d8-9510-4dc6-bfa2-13f4b9b1e996.png?resizew=295)
(1)求直线
的解析式;
(2)如图1,线段
的中垂线上有一点
,设
的面积为
,菱形
的面积为
,当
时,求点E的坐标;
(3)如图2,
为
轴上一点,连接
,动点
从点
出发,以
个单位/秒的速度沿
方向运动,1秒后,动点
从点
出发,以
个单位/秒的速度沿折线
方向运动,设点P运动时间为t秒(
),是否存在实数
,使得以
为顶点的三角形与
相似?若存在,求出相应的
值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f17a3fa4036efe1d4c35c14e57952e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663e2a3c6f6988e81c4ffcf1bddd1c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/91b791d8-9510-4dc6-bfa2-13f4b9b1e996.png?resizew=295)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
(2)如图1,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca932a59ba9a316cc74d769837bc7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f17a3fa4036efe1d4c35c14e57952e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24078bf80d509cd9b48a151d9b16393.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c9f557d23a16389aacfd66d7484091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b5e1433d7c2ad6a5b2de8a557a43d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255aeb7e872740911e79ac5f79eed05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de40350110b9b3cdb3bf4d5b78db25e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace07d078895165cf28b921e3c037247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,在平面直角坐标系中,点A、B在坐标轴上,
,
,且满足
,将B点向上平移3个单位长度,再向右平移4个单位长度得到点C.
(1)求点C的坐标.
(2)若点D为x轴上一点,且满足
,求点D的坐标.
(3)平面内有两点
,
,点M、N不在直线
上,点P为直线BC上一点,且
,求m、n之间满足的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c09615735d331befd07664aa47cb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ec270587b75dbd8e2ff6e848fcc4cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/f85cf1c5-a8d9-4536-a876-d17515504343.png?resizew=221)
(1)求点C的坐标.
(2)若点D为x轴上一点,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d243aed6e0aad0ae3164838206d2d4ab.png)
(3)平面内有两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedfc36a60d35165ec9cf42102a2cff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f6997f07dddfa10bcc76d1786fb932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb78ac5497703035d46b2e6c1bed511.png)
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【推荐1】(1)在
中,
,
,
,且点D,E为边BC上的点(分
别不与点B,C重合,且点D在点E左侧).
①初步探究
如图1,若
,
,
,试探究BD,DE,CE之间的数量关系.
下面是小东的探究过程(不完整),请补充完整.
②类比探究
如图2,若
,
,
,请写出BD,DE,CE之间的数量关系,并就图2的情形说明理由.
(2)问题解决
如图3,在
中,
,
于点M,
,
,点N为线段BC上一动点,当点N为BC的三等分点时,直接写出AN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eba0a1d96f7810e5bfbd6efeee80522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a42badcf3f5165e343a1b520a5d156.png)
别不与点B,C重合,且点D在点E左侧).
①初步探究
如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
下面是小东的探究过程(不完整),请补充完整.
解:∵![]() ![]() ![]() ![]() ![]() ∴ ![]() 如图,将 ![]() ![]() ![]() 由旋转的性质,可知 ![]() ∴ ![]() ![]() ![]() ∴ ![]() ![]() ∴ ![]() ∴ ![]() ![]() ∵ ![]() ![]() ∴ ![]() 又∵ ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99181a04f226f4fd773d99d97cd39769.png)
(2)问题解决
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb909eaf6572dc2a0cac7557cb91d2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94febfbf27f54ed0071cb59ac52719b.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983353461456896/2983645609598976/STEM/41b0fcc7-0f92-42b2-b10c-7420466d4103.png?resizew=555)
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【推荐2】已知:
的半径为5,点
在直径
上,过点
作
的弦
,过点
作直线
的垂线
,垂足为点
.
时,求线段
的长;
(2)当点
是线段
的中点时,求
的长;
(3)如果
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd8d8afce77ffebd38aeffd4fe62d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】如图1,某厂家设计生产一款中药碾槽,碾槽底部为近似圆弧形(本题以圆弧记),槽内可以安放一个带轴的碾轮.将中药放入碾槽中,滚动碾轮,可将中药粉碎,碾槽简易示意图如图2所示.经测量碾槽两端
,
的距离为
,碾轮直径为
,碾轮中心轴的直径为
,设碾轮中心轴的截面圆圆心为
,当碾轮经过碾槽最低点
时,
恰好与
相切于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/849da68a-f125-43b9-92cb-9f3946871929.png?resizew=551)
(1)求点
,
的距离及碾槽底部圆弧
所在圆的半径
;
(2)将碾轮(包括点
)从图2的位置滚动到图17-3的位置,碾轮与碾槽的接触点从点
变成点
,求图3中
的度数.(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5df73433f151b6016f23788ebd995ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ae3c0fbf7d162b0293a03c29c027fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/849da68a-f125-43b9-92cb-9f3946871929.png?resizew=551)
(1)求点
![](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/4133c7b3a09a3f2d298a30f0801c9fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)将碾轮(包括点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38c210b4c9dcec1b6a036900c97fa28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02998596ce57780ae2e1542bd973dba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bda192938e6048ac769bad63a27aaf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8906c2d0201e75ff24dca193ce457f.png)
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【推荐2】[发现]
如图(1),
为
的一条弦,点C在弦
所对的优弧上,根据圆周角性质,我们知道
的度数_______(填“变”或“不变”);若
,则
_______°,爱动脑筋的小明猜想,如果平面内线段
的长度已知,
的大小确定,那么点C是不是在某一个确定的圆上运动呢?
[研究]
为了解决这个问题.小明先从一个特殊的例子开始研究.如图(2),若
,直线
上方一点C满足
,为了画出点C所在的圆,小明以
为底边构造了一个等腰
,再以O为圆心,
为半径画圆,则点C在
上.
请根据小明的思路在图(2)中完成作图(要求尺规作图,不写作法,保留作图痕迹).
后来,小明通过逆向思维及合情推理,得出一个一般性的结论,即:若线段
的长度已知,
的大小确定,则点C一定在某一个确定的圆上,即定弦定角必定圆,我们把这样的几何模型称之为“定弦定角”模型.
[应用]
(1)如图(3),
,平面内一点C满足
,则
面积的最大值为______.
(2)如图(4),已知正方形
,以
为腰向正方形内部作等腰
,其中
,过点E作
于点F,点P是
的内心,连接
,若正方形
的边长为2,求
的最小值.
如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e847513a54d0e5a8433f583767ccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/e2228fc6-8e40-4c3d-98ce-c18a9c5b60b0.png?resizew=740)
[研究]
为了解决这个问题.小明先从一个特殊的例子开始研究.如图(2),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
请根据小明的思路在图(2)中完成作图(要求尺规作图,不写作法,保留作图痕迹).
后来,小明通过逆向思维及合情推理,得出一个一般性的结论,即:若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
[应用]
(1)如图(3),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图(4),已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26c2c53046cbfe83f84f5393373589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】如图1,在
中,
,以
为底边作等腰
,连接
,作
,使得
,且
.
(1)如图2,若
,请按题意补全图形,并写出画图步骤;
(2)将线段
沿
的方向平移得到线段
,连接
,
①如图3,若
,求
的长;
②若
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c586719b7790641696b772c47293a361.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/2b6e1c3b-7874-4540-a16c-b95dda276f52.png?resizew=608)
(1)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
(2)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda1c1727681444f3c6af60fc46128bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd6bfe7e819aeaee6e75f9a43f4159c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】[问题情境]
在综合与实践课上,老师让同学们以“矩形纸片的剪拼”为主题开展数学活动.如图1,将矩形纸片ABCD沿对角线AC剪开,得到△ABC和△ACD.同学们量得AB=2cm,∠ACB=30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/ddc5c31f-6f4c-4b15-ac80-77176d4354da.png?resizew=538)
(1)[操作发现]
将图1中的△ACD以点A为旋转中心,按逆时针方向旋转∠α,使∠α=∠BAC,得到如图2所示的
,过点C作
的平行线,与
的延长线交于点E,则四边形
的形状是 (不用证明);
(2)创新小组将图1中的△ACD以点A为旋转中心,按逆时针方向旋转,使B,A,D三点在同一条直线上,得到如图3所示的
,连接
,取
的中点F,连接AF并延长至点G,使FG=AF,连接OG、
,得到四边形
,请你判断四边形
的形状,并证明你的结论;
(3)[实践探究]
缜密小组在创新小组发现结论的基础上,进行如下操作:将△ABC沿着BD向上平移,使点B与点A重合,此时A点平移至
点,
与
相交于点H,如图4,求
的长.
在综合与实践课上,老师让同学们以“矩形纸片的剪拼”为主题开展数学活动.如图1,将矩形纸片ABCD沿对角线AC剪开,得到△ABC和△ACD.同学们量得AB=2cm,∠ACB=30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/ddc5c31f-6f4c-4b15-ac80-77176d4354da.png?resizew=538)
(1)[操作发现]
将图1中的△ACD以点A为旋转中心,按逆时针方向旋转∠α,使∠α=∠BAC,得到如图2所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efbefecd3366c5a1562e9e54499d6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288abe01824f42cfe725509af5aec4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fa24e6e1e467f6964bfd663d83d1f3.png)
(2)创新小组将图1中的△ACD以点A为旋转中心,按逆时针方向旋转,使B,A,D三点在同一条直线上,得到如图3所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efbefecd3366c5a1562e9e54499d6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0378c59e64fdcc6ed8bd6b89bd18999a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cfd653d2cb8a3eda45bbded5004b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cfd653d2cb8a3eda45bbded5004b39.png)
(3)[实践探究]
缜密小组在创新小组发现结论的基础上,进行如下操作:将△ABC沿着BD向上平移,使点B与点A重合,此时A点平移至
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaebc9408ba1baf77c436b68a0dacce7.png)
您最近一年使用:0次