在平面直角坐标系xOy中,已知点A(0,2),点B在x轴上,以AB为直径作⊙C,点P在y轴上,且在点A上方,过点P作⊙C的切线PQ,Q为切点,如果点Q在第一象限,则称Q为点P的离点.例如,图1中的Q为点P的一个离点.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860155331911680/2864538900611072/STEM/a8a48c05-4aba-40b0-9974-518cc7ebc96f.png?resizew=393)
(1)已知点P(0,3),Q为P的离点.
①如图2,若B(0,0),则圆心C的坐标为 ,线段PQ的长为 ;
②若B(2,0),求线段PQ的长;
(2)已知1≤PA≤2, 直线l:
(k≠0).
①当k=1时,若直线l上存在P的离点Q,则点Q纵坐标t的最大值为 ;
②记直线l:
(k≠0)在
的部分为图形G,如果图形G上存在P的离点,直接写出k的取值范围.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860155331911680/2864538900611072/STEM/a8a48c05-4aba-40b0-9974-518cc7ebc96f.png?resizew=393)
(1)已知点P(0,3),Q为P的离点.
①如图2,若B(0,0),则圆心C的坐标为 ,线段PQ的长为 ;
②若B(2,0),求线段PQ的长;
(2)已知1≤PA≤2, 直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f2796099524bc90cebf5dc73c95365.png)
①当k=1时,若直线l上存在P的离点Q,则点Q纵坐标t的最大值为 ;
②记直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f2796099524bc90cebf5dc73c95365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057b0626b60041133adc2efe79fdfa5a.png)
20-21九年级上·北京·单元测试 查看更多[1]
(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
更新时间:2021-12-03 13:42:13
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相似题推荐
解答题-问答题
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困难
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【推荐1】如图1, 四边形ABCD为正方形(四个边相等, 四个内角都是90°) , AB平行于y轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/3273a40c-bbea-452a-9b3d-70e2bd29850a.png?resizew=479)
(1)如图1,已知
,正方形ABCD的边长为4, 直接写出点A,D,C的坐标;
(2)如图2,已知
,
,
, 点Q从C出发,以每秒2个单位长度的速度延射线CD方向运动,运动时间为t秒,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac229647a5f3f48af4924d1deac18934.png)
①当t=1时,求△BPQ的面积;
②当
时,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/3273a40c-bbea-452a-9b3d-70e2bd29850a.png?resizew=479)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32f6b9d0c1af91bc67c2c409f327bc3.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d04015890783f6b8b0264b1d1c9127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ae87c9559e59b7fcba8cf85ebb6427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41da30f4c19d9881f5f3333a69c818fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac229647a5f3f48af4924d1deac18934.png)
①当t=1时,求△BPQ的面积;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fdd8f4d04fa88cab48fac5b8137604.png)
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【推荐2】如图,在平面直角坐标系中,直线
交
轴于点
,交
轴于点
,
,
.
的长;
(2)如图2,
为
轴负半轴上一点,
的垂直平分线交直线
于
,设
的长为
,求线段
的长
与
的关系式;
(3)如图3,在(2)的条件下,过点
作
于
,
为
上一点,以
为斜边作等腰
,
,
,延长
交
于
,连接
、
,若
平分
,
,
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb421e212e40c8dc1087dd159e30b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60541590ef3c5dd7248f4b1484088f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图3,在(2)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55963a9b9b02737110f57a377b41cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91547f8d28535435f6482f28557e90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4656b00c68d4385a7c51dbefac8c46c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e17a8351be6029438e750fcc7b87ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd57370457051f4e23aa36105182ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bdee7807edba89958c84bf4bb85f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a36775168095280f72504478345bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d57c5366753582457cc87de6e90b302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d57c5366753582457cc87de6e90b302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b4eea854f71c03b451cd3005119f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3867b2b02441726fa24c1ee9123235b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2a296d404ee1d1d462394ab9384872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-证明题
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【推荐1】在正方形
中,点E是
边上的动点,且
,在
上依次截取
,
,直线
与直线
交于点P
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/1cc1ef1b-189f-466d-b579-15345c234f83.png?resizew=370)
(1)如图(1),当
时,求
的度数
(2)如图(2),当
时,作
于点M,
于点Q,连接
,N为
中点,连接
,试探究
与
的数量关系,并证明你的结论
![](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/987ebcb7a610848d0e6188152cfbfc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a2e63e2e76266d606946a11c1d75de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be311a436782b2a838073212453ef2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/1cc1ef1b-189f-466d-b579-15345c234f83.png?resizew=370)
(1)如图(1),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4bd1ff6961b94344115437d96e1bdb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937ab5aebc4af11586a602b0b4b97fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd067af13db0202761f71490d6a74444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc94d2886db80a11b81b71f9a6d1d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8490cab76a1a6e5cb35de8535be9be.png)
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【推荐2】【模型建构】
如图1,点O在直线
上,射线
,
位于直线
两侧,若
,则称
,
是关于直线
的对称角
当射线
,
位于
同侧且
时,可以通过作对顶角构造出对称角,可以反向延长射线
,得到
(如图2),或者反向延长射线
,则
(如图3).
【模型应用】
(1)小明受到模型启发,运用两种方法构造出对称角解决了下面问题:
如图4,点C,D在
上,点E,F在直线
外,连接
,
,
,
,若
,
,求
的度数.
方法一:延长
至H,使
,连接
,
方法二:延长
至H,使
,连接
,
请你依照小明的解题思路,任选一种方法,写出证明过程;
(2)小明又尝试将(1)中问题进行变式提出了新问题,请你应用“对称角”模型构造全等三角形或者按照自己的解题思路解答.
如图5,在
中,
,点D是
的中点,点E,F分别在
,
上,
,
,猜想
,
,
之间的数量关系,并说明理由.
【学以致用】
(3)如图6,在四边形
中,
,
,
,
相较于点E,且
,若
,
,求
的长.
如图1,点O在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
【模型应用】
(1)小明受到模型启发,运用两种方法构造出对称角解决了下面问题:
如图4,点C,D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84afb69b68118ab366b661818abf8c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100fc25ea045c174e66e48d4f0c66a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
方法一:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e2aa7d6feda1eddcd1421fb1b1fbca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
方法二:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9bc26abb83370469132b708f87123a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
请你依照小明的解题思路,任选一种方法,写出证明过程;
(2)小明又尝试将(1)中问题进行变式提出了新问题,请你应用“对称角”模型构造全等三角形或者按照自己的解题思路解答.
如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/ec8dc90d8e4cddcb1b21c34732cd18cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bb64de3eb4fb1f8f657a40c147ae02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【学以致用】
(3)如图6,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f438c6b7f3527959227eab7043e166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d875f0d9448d025bb6dfad47dd55fad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19faa41278c9f5013f17b201a75db964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-计算题
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名校
【推荐3】【概念认识】
与矩形一边相切(切点不是顶点)且经过矩形的两个顶点的圆叫做矩形的第Ⅰ类圆;与矩形两边相切(切点都不是顶点)且经过矩形的一个顶点的圆叫做矩形的第Ⅱ类圆.
(2)【计算求解】已知一个矩形的相邻两边的长分别为4和6,请求出它的第Ⅰ类圆和第Ⅱ类圆的半径长.
(3)【深入研究】如图④,已知矩形ABCD,用直尺和圆规作出矩形ABCD的第Ⅰ类圆或第Ⅱ类圆.(保留作图痕迹,并写出必要的文字说明)(第Ⅰ类圆,第Ⅱ类圆任选一个即可)
与矩形一边相切(切点不是顶点)且经过矩形的两个顶点的圆叫做矩形的第Ⅰ类圆;与矩形两边相切(切点都不是顶点)且经过矩形的一个顶点的圆叫做矩形的第Ⅱ类圆.
(2)【计算求解】已知一个矩形的相邻两边的长分别为4和6,请求出它的第Ⅰ类圆和第Ⅱ类圆的半径长.
(3)【深入研究】如图④,已知矩形ABCD,用直尺和圆规作出矩形ABCD的第Ⅰ类圆或第Ⅱ类圆.(保留作图痕迹,并写出必要的文字说明)(第Ⅰ类圆,第Ⅱ类圆任选一个即可)
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解答题-问答题
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困难
(0.15)
【推荐1】如图①、②、③是两个半径都等于2的
和
,由重合状态沿水平方向运动到互相外切过程中的三个位置,
和
相交于A、
两点,分别连接
、
、
、
和
.
(1)如图②,当
时,求两圆重叠部分图形的周长
;
(2)设
的度数为
,两圆重叠部分图形的周长为
,求
关于
的函数关系式,并写出自变量
的取值范围;
(3)在(2)中,当重叠部分图形的周长
时,则线段
所在的直线与
有何位置关系?请说明理由.除此之外,它们是否还有其它的位置关系?如果有,请直接写出其它位置关系时的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817b898a4106c0fc24edee630a9eed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca1d1079fc3ac3e8d44159329865cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85623f82c7d166bc6ae6b403cb5b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a5e3927b043383fcec844833d3f093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6177efbe56f9b8be0f41e52f5d2f14bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3fbcc83500a87910be63e9faf03ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在(2)中,当重叠部分图形的周长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ab1ee5bff40c30509750e578681e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85623f82c7d166bc6ae6b403cb5b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2013/5/20/1573653943967744/1573653949562880/STEM/b4a09dc3c7ad42c495560feec9bbe985.png?resizew=434)
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解答题-作图题
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困难
(0.15)
名校
解题方法
【推荐2】如图,一张半径为
的圆形纸片,点
为圆心,将该圆形纸片沿直线
折叠,直线
交
于
两点.
(1)若折叠后的圆弧恰好经过点
,利用直尺和圆规在图中作出满足条件的一条直线
(不写作法,保留作图痕迹),并求此时线段
的长度.
(2)已知
是
一点,
.
①若折叠后的圆弧经过点
,则线段
长度的取值范围是________.
②若折叠后的圆弧与直线
相切于点
,则线段
的长度为_________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/92d6c3b9-4d79-4027-ae23-2731b4f27363.png?resizew=254)
(1)若折叠后的圆弧恰好经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5518da069f954e0be18aeffe052c1c37.png)
①若折叠后的圆弧经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②若折叠后的圆弧与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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