如图,四边形ABCD内接于⊙O,∠BAD=90°,AC是对角线.点E在BC的延长线上,且∠CED=∠BAC.
(1)判断DE与⊙O的位置关系,并说明理由;
(2)BA与CD的延长线交于点F,若
,AB=4,AD=2,求AF的长.
(1)判断DE与⊙O的位置关系,并说明理由;
(2)BA与CD的延长线交于点F,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73f854e7561c943b460e6c84e26fb5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/275b7ec1-55e0-4c7b-a26b-6cc81e816f0d.png?resizew=139)
19-20九年级上·北京西城·期末 查看更多[7]
北京市西城区2019-2020学年九年级上学期期末数学试题北京市第八十中学2019-2020年九年级下学期数学模拟测试题山东省潍坊市寿光市2020-2021学年九年级上学期期中数学试题北京市东城区北京景山学校2021-2022学年九年级上学期期中数学试题(已下线)第二十一、二十二章 圆(基础过关)-2020-2021学年京改版九年级数学上册单元测试卷(已下线)北京市2021年中考数学真题变式汇编5福建省福州金山中学2023-2024学年九年级下学期开学考数学试题
更新时间:2021-11-10 12:45:59
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【推荐1】如图,在平面直角坐标系xOy中,O为坐标原点,点A(6,0),点B(0,6),△ABO的中线AC与y轴交于点C,且⊙M经过O,A,C三点.
(1)圆心M的坐标为 ;
(2)抛物线经过点B,且以圆心M为顶点,求抛物线的解析式;
(3)若直线AD与⊙M相切于点A,交y轴于点D,求直线AD的函数表达式;
(4)若(2)中的抛物线上有一动点P,过点P作PE∥y轴,交(3)中的直线AD于点E.若以PE为半径的⊙P与直线AD相交于另一点F.求EF的最小值.
(1)圆心M的坐标为 ;
(2)抛物线经过点B,且以圆心M为顶点,求抛物线的解析式;
(3)若直线AD与⊙M相切于点A,交y轴于点D,求直线AD的函数表达式;
(4)若(2)中的抛物线上有一动点P,过点P作PE∥y轴,交(3)中的直线AD于点E.若以PE为半径的⊙P与直线AD相交于另一点F.求EF的最小值.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2619166229143552/2624478645190656/STEM/8e4859f9d4f3417e97991ecdfeaaf114.png?resizew=221)
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【推荐2】已知圆P的圆心在反比例函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
图象上,并与x轴相交于A、B两点. 且始终与y轴相切于定点C(0,1).
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516399468544/1573516505505792/STEM/00b42150b0024b378a1051b1871c9e14.png?resizew=479)
(1)求经过A、B、C三点的二次函数图象的解析式;
(2)若二次函数图象的顶点为D,问当k为何值时,四边形ADBP为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0d33cc937822b1e2d1ef5b3478a04c.png)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516399468544/1573516505505792/STEM/00b42150b0024b378a1051b1871c9e14.png?resizew=479)
(1)求经过A、B、C三点的二次函数图象的解析式;
(2)若二次函数图象的顶点为D,问当k为何值时,四边形ADBP为菱形.
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【推荐1】
内接于
,
为
半径,D为
上一点,
于H.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/825812ee-7ace-486b-b21c-c2a3b264cd92.png?resizew=394)
(1)如图1,求证:
;
(2)如图2,若
于F,交
于G,求证:
;
(3)在(2)的条件下,若
,
,求
的弦
的长.
![](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/ef4113c492885ba7c47fe42ac792578f.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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/825812ee-7ace-486b-b21c-c2a3b264cd92.png?resizew=394)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712dab4364e3c2d68e6fca6fc6112142.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9733836fa2027c0982c9d1663b0cd47b.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7c3c5286a9d33f2499888c267a5998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b70e9b67e3476304f1704bf97a511f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,AB是⊙O的直径,点C、D在⊙O上,
,过点D作EF⊥AC,垂足为E,交AB的延长线于点F.
(1)求证:直线EF是⊙O的切线;
(2)若AE=1,∠F=30°,则⊙O半径长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322f38142929403e7316fb20de05ae1c.png)
(1)求证:直线EF是⊙O的切线;
(2)若AE=1,∠F=30°,则⊙O半径长为 .
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497339733073920/2498638640570368/STEM/99127fae0be94943a0bcd8331fc30d81.png?resizew=172)
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【推荐1】矩形
在直角坐标系中的位置如图所示,A、C两点的坐标分别为
、
,直线
与
边相交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/8ecc7498-5846-4ed0-9fd0-1952a6232b73.png?resizew=186)
(1)若抛物线
经过D、A两点,试确定此抛物线的表达式;
(2)若以点A为圆心的
与直线
相切,试求
的半径;
(3)设(1)中抛物线的对称轴与直线
交于点M,在对称轴上是否存在点Q,以Q、O、M为顶点的三角形与
相似.若存在,试求出符合条件的Q点的坐标;若不存在,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e357eebd36c7985f6624b016be0edff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86bebdf5931efbdc627baa52f97392e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/8ecc7498-5846-4ed0-9fd0-1952a6232b73.png?resizew=186)
(1)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea15998a4a4f4522f571e0d4c91efe02.png)
(2)若以点A为圆心的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
(3)设(1)中抛物线的对称轴与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
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【推荐2】如图,在
中,点
在
上,且
,
过点
且与
相切于点
,与
相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/b6eb4fb2-fb45-48e3-9081-48b01fc78c0e.png?resizew=207)
(1)求
的度数.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/52f9cb93947d668d2e054348103f8bf3.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774c563aec0a5ee248700963fe3e3977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/b6eb4fb2-fb45-48e3-9081-48b01fc78c0e.png?resizew=207)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2221947a1e1b8312e60d4c4eaca8456c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】已知:∠MBN=90°,点A在射线BM上,点C在射线BN上,D在线段BA上,⊙O是△ACD的外接圆;
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573153792/STEM/99a22d0b-3edc-4e2b-8306-02be7106805f.png?resizew=578)
(1)若⊙O与BN的另一个交点为E,如图1,当
,BD=1,AD=2时,求CE的长;
(2)如图2,当∠BCA=∠BDC时,判断BN与⊙O的位置关系,并说明理由;
(3)如图3,在BN上作出C点,使得∠ACD最大,并求当AD=2,
时,⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2022/2/13/2915448983453696/2918195573153792/STEM/99a22d0b-3edc-4e2b-8306-02be7106805f.png?resizew=578)
(1)若⊙O与BN的另一个交点为E,如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27718c7561d646d66db48e330332471c.png)
(2)如图2,当∠BCA=∠BDC时,判断BN与⊙O的位置关系,并说明理由;
(3)如图3,在BN上作出C点,使得∠ACD最大,并求当AD=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b868fb5ae1ec7c7aca384557137ab704.png)
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【推荐2】早在公元前古希腊数学家欧几里得就发现了垂径定理,即垂直于弦的直径平分弦.阿基米德从中看出了玄机并提出:如果条件中的弦变成折线段,仍然有类似的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/67db63ec-bc77-4c00-8807-4a17a540bedf.png?resizew=554)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/947fdec7-0739-4d3d-96fd-ca0efdef411d.png?resizew=227)
某数学兴趣小组对此进行了探究,如图1,
和
是
的两条弦(即折线段
是圆的一条折弦),
,
是
的中点,过点
作
,垂足为
,小明通过度量
、
、
的长度,发现点
平分折弦
,即
.小丽和小军改变折弦的位置发现
仍然成立,于是三位同学都尝试进行了证明:
小军采用了“截长法”(如图2),在
上㵶取
,使得
,……
小丽则采用了“补短法”(如图3),延长
至
,使
,……
小明采用了“平行线法”(如图4),过
点作
,交圆于点
,过点
作
,……
(1)请你任选一位同学的方法,并完成证明;
(2)如图5,在网格图中,每个小正方形边长均为1,
内接于
(A、B、C均是格点),点A、D关于
对称,连接
并延长交
于点
,连接
.
①请用无刻度的直尺 作直线
,使得直线
平分
的周长;
②求
的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/67db63ec-bc77-4c00-8807-4a17a540bedf.png?resizew=554)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/947fdec7-0739-4d3d-96fd-ca0efdef411d.png?resizew=227)
某数学兴趣小组对此进行了探究,如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093db5b63dfd1ac4c84692a168f7ace0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d80f2addb9f19c08e39b201b226d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4d54b7ff95f2bb56fc6f7979fae83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5fab63b72493788e8b770bebffd7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5fab63b72493788e8b770bebffd7cd.png)
小军采用了“截长法”(如图2),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7595bdaea3dfa548c0fcfe3708387476.png)
小丽则采用了“补短法”(如图3),延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042763e09cec08506df433f8ad96f19f.png)
小明采用了“平行线法”(如图4),过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75d88dfdd826db33fd338ddbeec6887.png)
![](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/58cc90fee532e50d319081d571410421.png)
(1)请你任选一位同学的方法,并完成证明;
(2)如图5,在网格图中,每个小正方形边长均为1,
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
②求
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