如图,在等腰
中,
,O和D为线段AC的三等分点,以O为圆心,线段OC的长为半径画圆.
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920374721282048/2930562885615616/STEM/4f04932d73854b1ba5ac3a1b3b994ce8.png?resizew=178)
(1)求证:AB是圆O的切线;
(2)若圆O的半径为1,求阴影部分面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920374721282048/2930562885615616/STEM/4f04932d73854b1ba5ac3a1b3b994ce8.png?resizew=178)
(1)求证:AB是圆O的切线;
(2)若圆O的半径为1,求阴影部分面积是多少?
21-22九年级下·湖南长沙·开学考试 查看更多[2]
更新时间:2022-03-06 20:28:21
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解题方法
【推荐1】如图,在正方形ABCD中,以BC为直径作半圆O,以点D为圆心、DA为半径做圆弧交半圆O于点P.连结DP并延长交AB于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/dec09f13-a827-4cdc-885c-83d03d6403af.png?resizew=125)
(1)求证:DE为半圆O的切线;
(2)求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/dec09f13-a827-4cdc-885c-83d03d6403af.png?resizew=125)
(1)求证:DE为半圆O的切线;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
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【推荐2】如图,在 Rt
中,
,以
为直径的
交
于点E,点D是
边上的中点,连接
.
(1)求证:
与
相切;
(2)连接
交
于点F,若
的半径为3,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/32bbc8d4-3790-4f52-aa15-b5679e90d982.png?resizew=249)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15050bca19a35e73e058efe552468701.png)
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【推荐1】如图,
是
的直径,
是半圆
上的一点,
平分
,垂足为
,
交
于
,连接
.
(1)判断
与
的位置关系,并证明你的结论;
(2)若
,求
的长;
(3)若
是弧
的中点,
的半径为5,求图中阴影部分的面积.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369e5aa902a0de337c4372b383f11808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/b6f6fbe2-362e-4f84-b28f-500aa5db84ac.png?resizew=148)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3269c1a92b3873a9452990bace6ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)若
![](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/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,AB为⊙O的直径,C为⊙O上一点,∠ABC的平分线交⊙O于点D,DE⊥BC于点E.
(1)试判断DE与⊙O的位置关系,并说明理由;
(2)过点D作DF⊥AB于点F,若∠ABD=
,DF=3,求图中阴影部分的面积.
(1)试判断DE与⊙O的位置关系,并说明理由;
(2)过点D作DF⊥AB于点F,若∠ABD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615583264440320/2618508387614720/STEM/222527ed5793449f9a0606748ec0e71c.png?resizew=164)
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【推荐1】问题提出
(1)如图1,在
中,
,
,
的平分线交
于点D.过点D分别作
.垂足分别为E,F,则图1中与线段
相等的线段是 .
问题探究
(2)如图2,
是半圆O的直径,
.P是
上一点,且
,连接
,
的平分线交
于点C,过点C分别作
,垂足分别为E,F,求线段
的长.
问题解决
(3)如图3,是某小区内“儿童乐园”的设计示意图.已知
的直径
,点C在
上,且
.P为
上一动点,连接
并延长,交
于点D.连接
,
.过点P分别作
,垂足分别为E,F.按设计要求,四边形
为沙坑,阴影部分地面铺设塑胶,圆内其余部分为绿化区.按照设计要求,发现沙坑(四边形
)的面积为
时,整体布局比较合理.试求当四边形
的面积为
时
的长.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777b2fbc01cfc26cde436f625a5b7cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535ae08686abe8e4882b6b9cdf3e5b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
问题探究
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8172dd9b40b35369ce5b5228dc92e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e6437cf95a5cc5b920fa0cfed0eb50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfee3ad82daa98b6470035c5ebb456b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac1a4c6dd0e30433d3fc79f2a70dfb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
问题解决
(3)如图3,是某小区内“儿童乐园”的设计示意图.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c61b9e1946467d78559dcc324d92423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2838cfaea5db0a40eaaeb5a26b313b16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b128d4aeb3eacab7751bfb7a03af30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a21fda943ed389447a33e5e88c5f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a21fda943ed389447a33e5e88c5f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/f3bf06d4-56aa-4e86-b81c-1096da3390fd.png?resizew=510)
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【推荐2】如图,在平面直角坐标系中,A(0,4),B(3,4),P 为线段 OA 上一动点,过 O,P,B 三点的圆交 x 轴正半轴于点 C,连结 AB, PC,BC,设 OP=m.
(1)求证:当 P 与 A 重合时,四边形 POCB 是矩形.
(2)连结 PB,求 tan∠BPC 的值.
(3)记该圆的圆心为 M,连结 OM,BM,当四边形 POMB 中有一组对边平行时,求所有满足条件的 m 的值.
(4)作点 O 关于 PC 的对称点O ,在点 P 的整个运动过程中,当点O 落在△APB 的内部 (含边界)时,请写出 m 的取值范围.
(1)求证:当 P 与 A 重合时,四边形 POCB 是矩形.
(2)连结 PB,求 tan∠BPC 的值.
(3)记该圆的圆心为 M,连结 OM,BM,当四边形 POMB 中有一组对边平行时,求所有满足条件的 m 的值.
(4)作点 O 关于 PC 的对称点O ,在点 P 的整个运动过程中,当点O 落在△APB 的内部 (含边界)时,请写出 m 的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168954865844224/2171860066934784/STEM/87940a85eb3e46049752e74970649a10.png?resizew=126)
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