在锐角
中,
,
.
(1)如图1,求
外接圆的直径;
(2)如图2,点I为
的内心,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac28300251806a2f96c7bbd442eda1.png)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,点I为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/dceb13fb-bfd1-49ef-8a3a-d495546a1ada.png?resizew=317)
2012·湖北武汉·中考真题 查看更多[3]
(已下线)2012年初中毕业升学考试(湖北武汉卷)数学中考数学锐角三角函数及其应用过关演练(三)(已下线)猜题08 圆(易错必刷40题13种题型专项训练)-2023-2024学年九年级数学上学期期末考点大串讲(北师大版)
更新时间:2016-12-05 10:28:31
|
相似题推荐
解答题-证明题
|
适中
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真题
【推荐1】如图,已知
是
的角平分线,⊙O经过A、B、D三点,过点B作
,交⊙O于点E,连接
.
![](https://img.xkw.com/dksih/QBM/2015/7/7/1573864606351360/1573864612831232/STEM/f5c566b0f6354271b101b297e3cd7dd2.png?resizew=218)
(1)求证:
;
(2)若
,设
的面积为
,
的面积为
,且
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1049051d7a4b001fe585f22e09365b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/2015/7/7/1573864606351360/1573864612831232/STEM/f5c566b0f6354271b101b297e3cd7dd2.png?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc22c901160e072ae13a66f62c489f21.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d78524f98b01fa1dadfd277939665b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96715995549e5e48494101570bb3bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0217632ca57840d7db80601fc0d2f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
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【推荐2】在
中,
,点
在以
为直径的半圆内.分别按下列要求画图(不能使用圆规,保留画图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/13882ef2-dd21-475b-bb37-4df297fb1e3d.png?resizew=158)
(1)请在图中画出
边上的高
,并说明理由.
(2)请在图中画出弦
,使得
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/13882ef2-dd21-475b-bb37-4df297fb1e3d.png?resizew=158)
(1)请在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)请在图中画出弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
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解答题-证明题
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【推荐1】如图,在
中,
,以
上的一点
为圆心,
为半径作
,与
切于点
,交
于点
,交
于点
.
(1)求证:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/9a5cf3e2-dfdf-4fbb-903d-99cca8c6e61b.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b48370e7991eb63cf24496a9fb89e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8beab26db66465c229c73f834b98a5a8.png)
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解答题-证明题
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【推荐2】如图,在
中,以
为直径作半圆O,分别交
,
于点D,E,
.
(1)求证:
.
(2)若
,求
,
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6703a78d8d161ec1b7bcd5dcfe45b22e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/95942641-6d02-4e12-a0fa-f23424863749.png?resizew=99)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219f604632bd927bce98fd7ed35f040b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
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解答题-问答题
|
适中
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【推荐1】已知
,
,
是
的三边长,且
.
(1)求
,
,
的值;
(2)求
外接圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2671ae30f92746099d1f7d51f950f90.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐2】如图,已知AD既是△ABC的中线,又是角平分线,请判断:
(1)△ABC的形状;
(2)AD是否过△ABC外接圆的圆心O,⊙O是否是△ABC的外接圆,并证明你的结论.
(1)△ABC的形状;
(2)AD是否过△ABC外接圆的圆心O,⊙O是否是△ABC的外接圆,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2019/1/10/2115708824305664/2117212934209536/STEM/32654e9dc1e54e6a9251890f869d73a3.png?resizew=104)
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解答题-证明题
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【推荐1】如图1,在
中,
与
边相切,延长
交圆于点
,点
为圆上一点,且
.
(1)求证:
与
相切;
(2)当点
与点
重合时,求
的度数;
(3)如图2,若
的半径为
交圆于点
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c87ddf3f54b40228e28de2250016da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1fe7660ee42b8d3a9c076b700ae59a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/e96352eb-bedb-484e-9313-aa2ab514e4fc.png?resizew=253)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当点
![](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/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0899794c3c2b59f5804d194e92c1e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解答题-证明题
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适中
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【推荐2】在课外活动中,我们要研究一种四边形--筝形的性质.
定义:两组邻边分别相等的四边形是筝形(如图1).
小聪根据学习平行四边形、菱形、矩形、正方形的经验,对筝形的性质进行了探究.
下面是小聪的探究过程,请补充完整:
(1)根据筝形的定义,写出一种你学过的四边形满足筝形的定义的是 ;
(2)通过观察、测量、折叠等操作活动,写出两条对筝形性质的猜想,并选取其中的一条猜想进行证明;
(3)如图2,在筝形ABCD中,AB=4,BC=2,∠ABC=120°,求筝形ABCD的面积.
定义:两组邻边分别相等的四边形是筝形(如图1).
小聪根据学习平行四边形、菱形、矩形、正方形的经验,对筝形的性质进行了探究.
下面是小聪的探究过程,请补充完整:
(1)根据筝形的定义,写出一种你学过的四边形满足筝形的定义的是 ;
(2)通过观察、测量、折叠等操作活动,写出两条对筝形性质的猜想,并选取其中的一条猜想进行证明;
(3)如图2,在筝形ABCD中,AB=4,BC=2,∠ABC=120°,求筝形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2019/6/21/2230206714429440/2230494667309056/STEM/a422a62aaf2c47c2a0fb78bbb7700bda.png?resizew=225)
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解答题-证明题
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【推荐3】阅读下列相关材料,并完成相应的任务.
任务:
(1)请你完成这个定理的证明过程.
(2)该数学兴趣小组的同学在该定理的基础上写出了另外一个命题:若圆内接四边形的对角线互相垂直,则一边中点与对角线交点的连线垂直于对边请判断此命题是 命题.(填“真”或“假”)
(3)若
,求
的长.
布拉美古塔定理 婆罗摩笈多是古印度著名的数学家、天文学家,他编著了《婆罗摩修正体系》,他曾经提出了“婆罗摩笈多定理”,也称“布拉美古塔定理”.定理的内容是:若圆内接四边形的对角线互相垂直,则垂直于一边且过对角线交点的直线平分对边. 某数学兴趣小组的同学写出了这个定理的已知和求证. 已知:如图,在圆内接四边形 ![]() ![]() ![]() ![]() ![]() 求证:M是 ![]() |
(1)请你完成这个定理的证明过程.
(2)该数学兴趣小组的同学在该定理的基础上写出了另外一个命题:若圆内接四边形的对角线互相垂直,则一边中点与对角线交点的连线垂直于对边请判断此命题是 命题.(填“真”或“假”)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080d244a878edc259fd15056c883f12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
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