如图,AB是⊙O的弦,过AB的中点E作EC⊥OA于C,过点B作⊙O的切线BD交CE的延长线于点D.
(1)求证:DB=DE;
(2)连接AD,若AB=24,DB=10,求四边形OADB的面积.
(1)求证:DB=DE;
(2)连接AD,若AB=24,DB=10,求四边形OADB的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/0b74817b-0c06-4150-9a9b-8a99052881c7.png?resizew=130)
2019·陕西西安·三模 查看更多[5]
2019年陕西省西安市碑林区西北工大附中中考数学三模试题陕西省西安工大附中2018-2019学年九年级下学期第三次适应性训练数学试题2020年湖北省黄冈市启黄中学中考二模数学试题(已下线)【万唯原创】与圆有关的位置关系·满分特训(三)(已下线)【万唯原创】2021年陕西省试题研究-练册-第六章2
更新时间:2020-06-29 20:21:01
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解答题-作图题
|
适中
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【推荐1】数学课上,老师画出一等腰
并标注:
,
,然后让同学们提出有效问题并解决请你结合同学们提出的问题给予解答.
(1)甲同学提出:
______度;
(2)乙同学提出:
的面积为:______;
(3)丙同学提出:点D为边
的中点,
,
,垂足为E、F,请求出
的值;
(4)丁同学说受丙同学启发,点D为边
上任一点,
,
,
,垂足为E、F、H,则有
.请你为丁同学说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/23042914-88c0-4731-9382-b39b1660ea64.png?resizew=344)
(1)甲同学提出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60946bfa70c8db42f86760aff4bf3337.png)
(2)乙同学提出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)丙同学提出:点D为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/506bbc434d386f2d8e10607b70c56c18.png)
(4)丁同学说受丙同学启发,点D为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55963a9b9b02737110f57a377b41cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee3033a93e7ba600163570949a418a9.png)
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名校
【推荐2】在四边形ABCD中,AB=AD,CB=CD,AC与BD相交于O点,OC=OA.
(2)如图(2)若E是AB延长线上的一点,BE=AD,连接CE,则在不添加任何辅助线的情况下,直接写出图(2)中面积等于△BCE面积的所有三角形(△BCE除外).
(2)如图(2)若E是AB延长线上的一点,BE=AD,连接CE,则在不添加任何辅助线的情况下,直接写出图(2)中面积等于△BCE面积的所有三角形(△BCE除外).
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解答题-问答题
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【推荐1】已知:如图,
是
的外接圆,
平分
的外角
,
,
,垂足分别是点M,N,且
.
的度数;
(2)如果
,
,求
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd6ec8fa1147280a0eaba74744b2d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9ebf55cadec703db791e748c72ee03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9ac0a7acd8f9e937610741313230e3.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55493e331f88d3d1c396e92b46c97ecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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【推荐2】如图1,在
中,
,弦
,弓形AB是由
和弦
所围成的图形,弓形
的高是弧的中点到
的距离,将弓形
绕点B顺时针旋转
,点A的对应点为点
,如图2所示.
(1)分别求弓形
的高和弓形
的面积;
(2)当直线
与
相切时,求
的度数;
(3)当点O落在弓形
(阴影部分,包括边界)内时,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60057103273cbf497495520528da7dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/b4fb6b74-76d4-47fc-a424-7485c7ee7658.png?resizew=306)
(1)分别求弓形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)当点O落在弓形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐1】如图,在⊙O中,点P为直径BA延长线上一点,PD切⊙O于点D、过点B作BH⊥PH,点H为垂足,BH交⊙O于点C,连接BD,CD.
(1)求证:BD平分∠ABH;
(2)若CD=2,∠ABD=30°,求⊙O的直径的长.
(1)求证:BD平分∠ABH;
(2)若CD=2,∠ABD=30°,求⊙O的直径的长.
![](https://img.xkw.com/dksih/QBM/2018/11/17/2077590067519488/2078282685079552/STEM/4f86c1c4b4994c288767453da025c0f3.png?resizew=217)
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【推荐2】如图,
为
的弦,过点O作
的垂线交
于C,D两点,垂足为M,连接
,点P为弧
上一个动点,过点P作
的切线交
延长线于点E,交
延长线于点F,连接
交
于点Q.
(1)求证:
;
(2)当
时,若
,求
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/f52a58fbaf4fea03567e88a9f0f6e37e.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/9a520967-69d6-4527-a010-dedd43fa7761.png?resizew=130)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecd4fe1a5216c107878e1b1c11f7155.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b73db43b2ded725b5ec0fde022b32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2329bb41ce26b7d5d5771cbdf218e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-证明题
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【推荐1】如图1,在
中,
,点
是
延长线上的一点,
,垂足为
,联结
.
![](https://img.xkw.com/dksih/QBM/2019/11/8/2329492417323008/2329731872202752/STEM/304c00a598124e7d88d6c95021d7e570.png?resizew=282)
![](https://img.xkw.com/dksih/QBM/2019/11/8/2329492417323008/2329731872202752/STEM/08e7eb8f549e404bacb64fba3497be41.png?resizew=262)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b12d0f6cd816c49a801d1d84d7e823.png)
(2)当点
是
中点时,求
的值;
(3)如图2,
的延长线交
的平行线
于点
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7fe0efadcdeaa3a391722316596b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2019/11/8/2329492417323008/2329731872202752/STEM/304c00a598124e7d88d6c95021d7e570.png?resizew=282)
![](https://img.xkw.com/dksih/QBM/2019/11/8/2329492417323008/2329731872202752/STEM/08e7eb8f549e404bacb64fba3497be41.png?resizew=262)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b12d0f6cd816c49a801d1d84d7e823.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1118b0a5b263e315e32fec8306ca70d9.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4013529cbaa78d1578274fab5dd7ddb5.png)
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【推荐2】问题提出
(1)如图①,
的半径为2,
外一点
到圆心
的距离为4,
上一动点
到点
的最短距离为______;
问题解决
(2)如图②,是由线段
、
、
与
围成的菜地平面示意图,
,
,
,
,点
为
的中点,
所对的圆心角为
.菜农李大爷想在
上确定一点
,在四边形
区域内种植生菜和青菜,其余区域内种植白菜,并过点
修建一条小路
(小路的面积忽略不计),把四边形
分成面积相等且尽可能小的两部分,分别用来种植生菜、青菜.请问是否存在满足上述条件的小路
?若存在,请你帮李大爷求出小路
的长;若不存在,请说明理由.
(1)如图①,
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/5963abe8f421bd99a2aaa94831a951e9.png)
问题解决
(2)如图②,是由线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48324d6d5c33285ea76b67b4f0a5018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9634d01b0628212f6ccd797bbdd887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccc9ea8b2d878515fa99f763c4dc359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccc9ea8b2d878515fa99f763c4dc359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/2109c2a8-74a1-49fb-98a2-9eb9a782b1e1.png?resizew=308)
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