如图,
内接于⊙O,∠BAC=45°,AD⊥BC,垂足为D,BD=6,DC=4.
(1)求⊙O的半径;
(2)求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求⊙O的半径;
(2)求AD的长.
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497706742071296/2498488484962304/STEM/63cd0e3580c243948e0537d318738fb2.png?resizew=148)
2020·江苏南京·一模 查看更多[6]
2020年江苏省南京市鼓楼区中考数学一模试题(已下线)练习7 三角形的外接圆与外心-2020-2021学年【补习教材·寒假作业】九年级数学(苏科版)(已下线)专题20圆的基本性质-备战2021年中考数学考点 核心考点清单(江苏专用)(已下线)2022年江苏省扬州市中考数学变式题24-28(已下线)第03讲 圆、圆的对称性、确定圆的条件(3大考点7种解题方法)-2022-2023学年九年级数学考试满分全攻略(苏科版)(已下线)2022年江苏省扬州市中考数学真题变式汇编4
更新时间:2020-07-04 09:30:44
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,已知平面直角坐标系内,点
,点
,连接
.动点
从点
出发,沿线段
向点
运动,到达
点后立即停止,速度为每秒1个单位长度,设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/ee31f9ae-d5e0-4d19-bb7e-c6d2502d12db.png?resizew=319)
(1)当点
运动到
的中点时,求此时直线
的解析式.
(2)在(1)的条件下,若第二象限内有一点
,当
时,求
的值.
(3)如图2,当点
从点
出发运动时,同时有点
从点A出发,以每秒
个单位长度的速度沿直线
向上运动,点
停止运动时,点
也立即停止运动.过点
作
轴交
于点
.在运动过程中,是否存在
,使得
为等腰三角形?若存在,求出此时的
值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d1e4a02f6a99a4b838dcaf9541d7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6938eeb65411eeac15e140cf1db99773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/ee31f9ae-d5e0-4d19-bb7e-c6d2502d12db.png?resizew=319)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)在(1)的条件下,若第二象限内有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd9cbccba6c7b8fccee8327b603107b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a7f4a70af9b57940126dbe22fbbe22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ada707c061972d4e70925b538482e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
|
较难
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【推荐2】平行四边形
的对角线
相交于点
,
以
为边作正方形
,过点作
交直线
于点
,连接
.请画出符合题意的图形,并直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab30450a97dd1e1016c5352daa1ad8be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db0b84c4bba1e131db2083d496cc48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5af21f5f7e527d0ce86423739c04fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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解答题-证明题
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【推荐1】如图1,
是
的两条弦,且
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/526a3bc2-470a-4600-9ece-2288e1f803d5.png?resizew=303)
(1)若
,求证:
.
(2)如图2,连接
,若
,
①判断
与
具有怎样的数量关系,并说明理由.
②在
上存在点F,满足
,M是
的中点,连接
.若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/526a3bc2-470a-4600-9ece-2288e1f803d5.png?resizew=303)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0487ebca22d4aa1233073f81fd70a424.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbcbbf2ac9bac279d98721ce29ff8d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d365cc7ce9022654091eee60bc1c2b7.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76910dbe943677ef01e265ee92331089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565a57772ad9357e1cac02a8fa40ab81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
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较难
(0.4)
【推荐2】如图,
是
的直径,弦
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322513318256640/2322646581911552/STEM/de8aa0121b41482f8f405ea6ca363d01.png?resizew=244)
(1)求证:
是等边三角形.
(2)若点
是
的中点,连接
,过点
作
,垂足为
,若
,求线段
的长;
(3)若
的半径为4,点
是弦
的中点,点
是直线
上的任意一点,将点
绕点
逆时针旋转60°得点
,求线段
的最小值.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322513318256640/2322646581911552/STEM/de8aa0121b41482f8f405ea6ca363d01.png?resizew=244)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847fb5b050ec58880ff6a8ed0c811aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23e376ab222814e0029d2adb5a957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d8832f0a3f2d94862b613d4d9944c.png)
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解答题-问答题
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较难
(0.4)
【推荐1】如图,⊙O的直径FD⊥弦AB于点H,E是
上一动点,连结FE并延长交AB的延长线于点C,AB=8,HD=2.
![](https://img.xkw.com/dksih/QBM/2017/5/23/1693009778237440/1694799477276672/STEM/5c32ca03ffd74116be4389e58e9f0127.png?resizew=138)
(1)求⊙O的直径FD;
(2)在E点运动的过程中,EF•CF的值是否为定值?若是,求出其定值;若不是,请说明理由;
(3)当E点运动到
的中点时,连接AE交DF于点G,求△FEA的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129baba55117e8d5523746888024273a.png)
![](https://img.xkw.com/dksih/QBM/2017/5/23/1693009778237440/1694799477276672/STEM/5c32ca03ffd74116be4389e58e9f0127.png?resizew=138)
(1)求⊙O的直径FD;
(2)在E点运动的过程中,EF•CF的值是否为定值?若是,求出其定值;若不是,请说明理由;
(3)当E点运动到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416419aa360201f480ba06b283dfc1a2.png)
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解答题-证明题
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【推荐2】如图,等边
内接于
,
是
上任一点(点
不与点
、
重合),连
、
,过点
作
交
的延长线于点
.
(1)填空:
度,
度;
(2)求证:
是等边三角形;
(3)若
,且点
可以运动到
上的任意位置,则
的最大值为 .(直接填空)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64dbdf7f239f366ad8c5523bc066224a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/2f71aa79-1386-4860-ac69-a637ebd2aed4.png?resizew=106)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1e8d3e9fe016f1581fc5d16c36d12b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1de94901207fc22febd4bf4760fd970.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1490f8bd695ad195aa1a52fe36373.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04be58ea6ca37a850422631eb3e994d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】如图,已知抛物线
:
与x轴交于A,B两点(点A在点B的右边),顶点为点C.将抛物线
绕点A旋转
后得抛物线
,其中顶点C的对应点为点E,点B的对应点为点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/b1818e47-ab16-4151-ba66-5a123f1b8f7b.png?resizew=262)
(1)当
时,求抛物线
的解析式;
(2)如图1,连结
,
,
,当
是直角三角形时,求a的值;
(3)如图2,是否存在
外接圆面积的最小值,若存在,请直接写出a的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9d2927687308f6b5daf048e65eb6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/b1818e47-ab16-4151-ba66-5a123f1b8f7b.png?resizew=262)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
(2)如图1,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
(3)如图2,是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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解答题-应用题
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较难
(0.4)
名校
【推荐2】(1)如图1,在足球比赛场上,甲带球奔向对方球门
,当他带球冲到A点时,同伴乙已冲到B点,甲是自己射门好,还是将球传给乙,让乙射门好?
对上面这个问题,小明结合图1判断甲的视角
小于乙的视角
,根据“仅从射门角度考虑,球员对球门的视角越大,足球越容易被踢进”的经验,认为甲应该将球传给乙.请结合图1给出小明得到
的理由;
(2)德国数学家米勒曾提出最大视角问题,并得到这样的结论:如图2,点A,B是平面内两个定点,C是直线l上的一个动点,当且仅当
的外接圆与l相切于点C时,
最大.
如图3,
,点A,B是边
上两点,
,点C是边
上一动点.
①若
最大为
,请求出当
时,
的长;
②若
最大不超过
,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
对上面这个问题,小明结合图1判断甲的视角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665f6b6b650f8613d2ddea4ddc42e797.png)
(2)德国数学家米勒曾提出最大视角问题,并得到这样的结论:如图2,点A,B是平面内两个定点,C是直线l上的一个动点,当且仅当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f21711944d2f4afad781c594dcdbc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d9792485ccd1ba479ceba6397c15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/f7b3a48e-9c97-40da-8b51-070d5f1483c0.png?resizew=386)
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