如图,正六边形ABCDEF为⊙O的内接正六边形,过点D作⊙O的切线,交AF的延长线于点P,⊙O的半径为4,连接OD,OF.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962784284934144/2964495614779392/STEM/d588d97c-13f5-43b4-91d6-33d85d44f458.png?resizew=217)
(1)求
;
(2)连接DF,试判断DF和AP有什么特殊位置关系,并说明理由;
(3)求PD的长.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962784284934144/2964495614779392/STEM/d588d97c-13f5-43b4-91d6-33d85d44f458.png?resizew=217)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c577618f4999c31231a03e90d7b8c81f.png)
(2)连接DF,试判断DF和AP有什么特殊位置关系,并说明理由;
(3)求PD的长.
2022·河北邢台·一模 查看更多[3]
2022年河北省邢台市威县第三中学九年级中考模拟数学试题(已下线)第二十九章 直线与圆的位置关系(A卷-中档卷)-【单元测试】2022-2023学年九年级下数学分层训练AB卷【冀教版】(已下线)2022年河北中考数学一模圆的综合题
更新时间:2022-04-23 19:04:40
|
相似题推荐
解答题-问答题
|
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名校
【推荐1】已知
、
是
的切线,
、
为切点,连接
并延长,交
的延长线于点
,连接
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2019/12/19/2358471791173632/2358542913822720/STEM/cf41438b477a473db548e0fa5304e613.png?resizew=436)
如图①,若
,求
的大小;
如图②,连接
,若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2019/12/19/2358471791173632/2358542913822720/STEM/cf41438b477a473db548e0fa5304e613.png?resizew=436)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2342f64449927ccacfb945034d39389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26542001041dfba75b66e03a94ee408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a490119734a6399dbcb8998974e28eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd05a551ca00abcdecd3106de0e50e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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【推荐2】如图,
为
的直径,过圆外一点
作切线
、
,交
于点
和点
,连接
、
和
.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967192714379264/2970813138305024/STEM/8729e453-d6a3-4c89-a235-02da71c0a798.png?resizew=176)
(1)求证
.
(2)填空:
①当
________
时,四边形
为菱形;
②当
________
时,四边形
为正方形.
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967192714379264/2970813138305024/STEM/8729e453-d6a3-4c89-a235-02da71c0a798.png?resizew=176)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d786485cf63bca977290becd92c38c49.png)
(2)填空:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a5366947201942bb5e79a269167c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc2c2a75dcc424b8fb5d4683331df20.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a5366947201942bb5e79a269167c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8720d005d4d86a6bedd5590ff4e92f6b.png)
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【推荐1】(1)计算:-(
)-1
+3tan30°-20190+|1-
|
(2)如图,在正五边形ABCDE中,CA与DB相交于点F,若AB=1,求BF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2f0e7ec6b2f09b841b59987a2d48f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
(2)如图,在正五边形ABCDE中,CA与DB相交于点F,若AB=1,求BF.
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190600318631936/2196490600448000/STEM/1b9001ddc9f1466ebcb443e9d4aa90e0.png?resizew=105)
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【推荐2】如图,正六边形
的边长为2,求该正六边形的外接圆与内切圆所形成的圆环面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/93a39b4c-e7d5-46fe-8f5b-dabff3b2a9b8.png?resizew=140)
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【推荐2】如图,
中
,
,且
,以边
为直径的
交斜边
于
,
,点
为
左侧半圆上一点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/da41b562-dc62-4db3-bcbb-32c84caa851b.png?resizew=288)
(1)求
的度数.
(2)求
的长.
(3)求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093db5b63dfd1ac4c84692a168f7ace0.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/da41b562-dc62-4db3-bcbb-32c84caa851b.png?resizew=288)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(3)求图中阴影部分的面积.
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【推荐3】如图①,某公园在一个扇形
草坪上的圆心
处,垂直于草坪的地上竖一根柱子
,在
处安装一个自动旋转喷水装置,喷头向外喷水,爱思考的小西发现喷出的水流呈现出抛物线形状.
喷出的水距地面的高度
米与喷出的水与柱子
的水平距离
米之间有怎样的函数关系?
【分析问题】
小西测出连喷头在内
高
,喷出的水流在与
点的水平距离4米处达到最高点
,点
距离地面2米.于是小西以
所在直线为
轴,垂直于
的地平线为
轴,点
为坐标原点,建立如图②所示的平面直角坐标系,根据测量结果得到点
,点
的坐标,从而得到
与
之间的函数关系式.
【解决问题】
(1)求水流所在抛物线的函数表达式;
(2)当喷头从草坪最边缘开始旋转
时,这个草坪刚好被水流覆盖,求这个草坪的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0f9bc9123d19a09babe8609cf12327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
喷出的水距地面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【分析问题】
小西测出连喷头在内
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa19dcfee387debc6bf2ae9564dd6c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【解决问题】
(1)求水流所在抛物线的函数表达式;
(2)当喷头从草坪最边缘开始旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
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【推荐1】(1)如图,点A、B、C、D在同一条直线上,BE∥DF,∠A=∠F,AB=FD.求证:AE=FC.
(2)如图,在梯形ABCD中,AD∥BC,∠B=90°,AD=2,BC=5,tanC=
,求腰AB的长.
(2)如图,在梯形ABCD中,AD∥BC,∠B=90°,AD=2,BC=5,tanC=
![](https://img.xkw.com/dksih/QBM/2014/7/11/1573737436741632/1573737442279424/STEM/b459fde90c094cfdb295983ccbc4412e.png)
![](https://img.xkw.com/dksih/QBM/2014/7/11/1573737436741632/1573737442279424/STEM/73254784cc27469180ae683fdbaf3ba8.png)
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【推荐2】已知二次函数
图象与x轴交于
,
两点.
(1)求这个二次函数表达式;
(2)抛物线上是否存在一点M,使得
,若存在,求出点M坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
(1)求这个二次函数表达式;
(2)抛物线上是否存在一点M,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557f5c1cf144da104fbcc3607eb50035.png)
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【推荐3】被誉为“天下第一塔”的开封铁塔,八角十三层,其设计精巧,单是塔砖就有数十种图案.铁塔位于铁塔公园的东半部,是园内重要的文物,也是主要的景点,始建于公元
年
北宋皇祐元年
,是
年我国首批公布的国家重点保护文物之一,素有“天下第一塔”之称.某数学兴趣小组开展了“测量开封铁塔的高度”的实践活动,具体过程如下:
工具准备:皮尺,测角仪.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947286209658880/2948085292916736/STEM/2e6e470a3428433c83490eebf8203924.png?resizew=485)
方案设计:
如图
,开封铁塔
垂直于地面,在地面上选取
,
两处分别测得
和
的度数(
在同一条直线上)
数据收集:
通过实地测量:地面上
,
两点的距离为
,
,
.
问题解决:
(1)求开封铁塔
的高度
精确到
景点介绍开封铁塔的高度为
米,则计算结果的误差为多少?并说出一条导致计算结果产生误差的原因可能是什么?(参考数据:
,
,
,
)
(2)根据上述方案及数据,请你完成求解过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a35a383f69557578fa359951cf44311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c02587a71d609a6976b14c97f6ba613.png)
工具准备:皮尺,测角仪.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947286209658880/2948085292916736/STEM/2e6e470a3428433c83490eebf8203924.png?resizew=485)
方案设计:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a91eda1c19d33d35d944da3d48576f.png)
数据收集:
通过实地测量:地面上
![](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/9b6363a9c7ab19b53bc1ddae6521a30a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d16216c2143fa483c5134596286ffa.png)
问题解决:
(1)求开封铁塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cc9d71363697d8a3411e13906cd0e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4570da08d7d873cea87ec2121561f68f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901144fcbcb8f19f8fd62ed41af7b6fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58157aa53421daeee7f090cd136b6a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eea00f3d00a902cef2f74d438d50334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
(2)根据上述方案及数据,请你完成求解过程.
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