如图,
为
的直径,C为
上一点,
和过C点的切线互相垂直,垂足为D.锐角
的平分线
交
于点C,作
,垂足为D,直线
与
的延长线交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/5ede8dae-abbc-4401-9fbc-52616d800007.png?resizew=119)
(1)求证:
平分
;
(2)过点O作线段
的垂线
,垂足为E(要求:尺规作图,保留作图痕迹,不写作法);
(3)若
,求垂线段
的长.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/5ede8dae-abbc-4401-9fbc-52616d800007.png?resizew=119)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
(2)过点O作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58450da778a31efd6f7cebc4a75c5463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
2011·广西钦州·中考真题 查看更多[3]
更新时间:2019-01-30 18:14:09
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】在学完圆的相关知识后,某数学兴趣小组利用课余时间探究过圆外一点作已知圆的切线,下面记录了部分探究过,组员小杜用尺规作图过一点作已知圆的切线.如图,已知⊙
及⊙
外一点P,求作:过点P的⊙
的切线.
①连接OP,作OP的垂直平分线MN交OP于点A;
②以A为圆心,OA为半径作⊙
,交⊙
于点B、C;
③作射线PB、PC;
则射线PB、PC即为所求.请完成以下问题:
![](https://img.xkw.com/dksih/QBM/2022/5/18/2981996967927808/2983301081497600/STEM/108e6b8c-f562-4cdd-9eae-1e69928eadbe.png?resizew=200)
(1)根据上述步骤,利用尺规作图(保留作图痕迹、不写作法),将图形补充完整;
(2)细心的小马同学通过认真观察,发现线段PB和PC满足一定的数量关系,请你将他的“已知”和“求证”补充完整,并证明.
已知:如图,PB、PC与⊙
相切于点B、C,
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①连接OP,作OP的垂直平分线MN交OP于点A;
②以A为圆心,OA为半径作⊙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
③作射线PB、PC;
则射线PB、PC即为所求.请完成以下问题:
![](https://img.xkw.com/dksih/QBM/2022/5/18/2981996967927808/2983301081497600/STEM/108e6b8c-f562-4cdd-9eae-1e69928eadbe.png?resizew=200)
(1)根据上述步骤,利用尺规作图(保留作图痕迹、不写作法),将图形补充完整;
(2)细心的小马同学通过认真观察,发现线段PB和PC满足一定的数量关系,请你将他的“已知”和“求证”补充完整,并证明.
已知:如图,PB、PC与⊙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
求证:
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,在△ABC中,∠C=90°.
(1)尺规作图:作AB边上垂直平分线DE,交AC于点D,交AB于点E;
(保留作图痕迹,不写作法和证明);
(2)在(1)的条件下,连接BD,若BC=3cm,,AC=4cm,求△BCD的周长.
(1)尺规作图:作AB边上垂直平分线DE,交AC于点D,交AB于点E;
(保留作图痕迹,不写作法和证明);
(2)在(1)的条件下,连接BD,若BC=3cm,,AC=4cm,求△BCD的周长.
![](https://img.xkw.com/dksih/QBM/2018/4/13/1923086429347840/1926725026930689/STEM/b185160d62eb43ad9b5827b02a917955.png?resizew=178)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】某园艺公司对一块直角三角形的花圃进行改造,测得两直角边长分别为6m、8 m.现要将其扩建成等腰三角形,且扩充部分是以8m为直角边长的直角三角形.请你设计出所有合适的方案,画出草图,并求出扩建后的等腰三角形花圃的面积.
![](https://img.xkw.com/dksih/QBM/2014/12/1/1573762412732416/1573762418753536/STEM/f5ce6029f77140f4b6a0534e1f323f4b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,四边形
是平行四边形,延长
至点
,
,连接
交
于点
,连接
.
为平行四边形;
(2)若
,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c231c1150e27c34eb787a46b02ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df3f49493b1f7317cbe2e95e79338a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1373c36aa03298d0bdc06d9bfdcb9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f98e9c9cbdad60f42c7be2e38a07915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,AB是⊙O的直径,C是弧AB的中点,⊙O的切线BD交AC的延长线于点D,E是OB的中点,CE的延长线交切线BD于点F,AF交⊙O于点H,连接BH.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966633842950144/2971676929761280/STEM/ac906c62-6ed2-4bef-af04-984e178a3ba1.png?resizew=145)
(1)求证:AC=CD
(2)若OB=2,求BH的长
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966633842950144/2971676929761280/STEM/ac906c62-6ed2-4bef-af04-984e178a3ba1.png?resizew=145)
(1)求证:AC=CD
(2)若OB=2,求BH的长
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
真题
【推荐2】为弘扬民族传统体育文化,某校将传统游戏“滚铁环”列入了校运动会的比赛项目.滚铁环器材由铁环和推杆组成.小明对滚铁环的启动阶段进行了研究,如图,滚铁环时,铁环⊙O与水平地面相切于点C,推杆AB与铅垂线AD的夹角为∠BAD,点O,A,B,C,D在同一平面内.当推杆AB与铁环⊙O相切于点B时,手上的力量通过切点B传递到铁环上,会有较好的启动效果.
(2)实践中发现,切点B只有在铁环上一定区域内时,才能保证铁环平稳启动.图中点B是该区域内最低位置,此时点A距地面的距离AD最小,测得
.已知铁环⊙O的半径为25cm,推杆AB的长为75cm,求此时AD的长.
(2)实践中发现,切点B只有在铁环上一定区域内时,才能保证铁环平稳启动.图中点B是该区域内最低位置,此时点A距地面的距离AD最小,测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45a6cc15d8c54c1b8d874b587153bea.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,
与
均为等边三角形,点E,F分别在
边上,且
,连接
相交于点G,连接
并延长交
于点H.
![](https://img.xkw.com/dksih/QBM/2021/4/6/2693955923451904/2698403083034624/STEM/3449949f-d9da-40b0-a66a-85887e37406c.png)
(1)求
的度数;
(2)求证:
;
(3)若H为
的中点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32833fa6f1155b51005ea04c1ac2ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/6/2693955923451904/2698403083034624/STEM/3449949f-d9da-40b0-a66a-85887e37406c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec88884321733714de9db5466629ccf2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd0ee7446ed7073987dd4c1cb6214c5.png)
(3)若H为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】综合与探究:
我们知道,三角形具有稳定性,但四边形具有不稳定性,容易变形.如图1,一个矩形发生变形后成为一个平行四边形,设这个平行四边形相邻两个内角中较小的一个内角为
,我们把
的值叫做这个平行四边形的倾斜度.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/9ecd3990-e85c-4b3f-a26c-76fe13fb4889.png?resizew=231)
(1)若矩形发生变形后的平行四边形有一个内角是
,则这个平行四边形的倾斜度为______.
(2)若倾斜度为
,设原矩形的面积为
,其变形后的平行四边形面积为
.试猜想
,
的数量关系:______.
(3)拓展探究:如图2,在矩形
中,
是
边上的一点,且
,这个矩形发生变形后为平行四边形
,
为
的对应点,连接
,
.若矩形
的面积为
(
),平行四边形
的面积为
,试求
的度数.
我们知道,三角形具有稳定性,但四边形具有不稳定性,容易变形.如图1,一个矩形发生变形后成为一个平行四边形,设这个平行四边形相邻两个内角中较小的一个内角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746967bc1079483ddae41d90b88f257f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/9ecd3990-e85c-4b3f-a26c-76fe13fb4889.png?resizew=231)
(1)若矩形发生变形后的平行四边形有一个内角是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be816ce1190862dc4f77d0d06f70efb7.png)
(2)若倾斜度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(3)拓展探究:如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4b0311cb57d78f465a57dc7f26353c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532b8508cc5e5775356b060cb9216085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f7eeb06cd905c9d8a13c1c67890417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f302580f07ce713027276db160189f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0994308617dda5a366b0d3b2c50e59f2.png)
您最近一年使用:0次