如图,已知AB是圆O的直径,BC是圆O的弦,弦ED⊥AB于点F,交BC于点G,过点C作圆O的切线与ED的延长线交于点P.
![](https://img.xkw.com/dksih/QBM/2013/9/11/1573682307391488/1573682405343232/STEM/a7027385730f46efad502c84cb4c3c74.png)
(1)求证:PC=PG;
(2)点C在劣弧AD上运动时,其他条件不变,若点G是BC的中点,试探究CG、BF、BO三者之间的数量关系,并写出证明过程;
(3)在满足(2)的条件下,已知圆为O的半径为5,若点O到BC的距离为
时,求弦ED的长.
![](https://img.xkw.com/dksih/QBM/2013/9/11/1573682307391488/1573682405343232/STEM/a7027385730f46efad502c84cb4c3c74.png)
(1)求证:PC=PG;
(2)点C在劣弧AD上运动时,其他条件不变,若点G是BC的中点,试探究CG、BF、BO三者之间的数量关系,并写出证明过程;
(3)在满足(2)的条件下,已知圆为O的半径为5,若点O到BC的距离为
![](https://img.xkw.com/dksih/QBM/2013/9/11/1573682307391488/1573682405343232/STEM/a69229c2bd574d7291f6eb07a99c2afb.png)
更新时间:2019-01-30 18:14:09
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】切割线定理:从圆外一点引圆的切线和割线,切线长是这点到割线与圆交点的两条线段长的比例中项.切割线定理揭示了从圆外一点引圆的切线和割线时,切线与割线之间的关系.
如图1,
是
外一点,
切
于点
,
交
于点
(即
是
的割线),则
.
证明:如图2,连接
并延长,交
于点
,连接
.
切
于点
,
.
.
是
的直径,
……
(1)根据前面的证明思路,补全剩余的证明过程;
(2)在图1中,已知
,
,则
______,
______.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99decde3fccc38eb205989bcddd48df2.png)
证明:如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99675ffa14c08ba5b63e9a3231203818.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ecf3902316908478068beebb8aa1411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b3055fd20bff953962a7262b79d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a471b9d297b47a73d379d88411d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b8eb1b1222afdb0adc4fe2e4af14a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
……
(1)根据前面的证明思路,补全剩余的证明过程;
(2)在图1中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ce0586aafd9bf4fb7e1be082624afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0236c4f451f4c9ed191aaab341215e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b54e4c765bf64af2a8cac93175917a5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐2】如图,
为半圆
的直径,
是⊙
的一条弦,
为
的中点,作
,交
的延长线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/ce062639dcaa41a6a9a68dfa7afe0d67.png)
(1)求证:
为半圆
的切线;
(2)若
,求阴影区域的面积.(结果保留根号和π)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/ad935008fe874f768e0783b724bd84f9.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/653c1b15effe43a284d9fbaffc58e752.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/2be898780182421bb466171c88c98790.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/653c1b15effe43a284d9fbaffc58e752.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/c39212f5b2dd4f4fa50ea5ef9310a7b0.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/7ea871db395947808a1578853b520945.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/96e44d358563430f8a11b78e4dd24369.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/a7b06865af21484c9a6367ace1756e17.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/9625079538f244d18c9e90fef2dfeb04.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/11838d83f885478e8b60a1a2f3304584.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/ce062639dcaa41a6a9a68dfa7afe0d67.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/843eab5a4ad64536ab4812bdbb1e805e.png)
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/653c1b15effe43a284d9fbaffc58e752.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2017/7/28/1773763204530176/1773763204972544/STEM/f786b2061efe4dd8ac5223597f0c55a9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在正方形
中,作等边三角形
,分别延长
交
于点
,连接
与
交于点
.
(1)求
的度数.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9ea82fbf17dc33c55abb9d460b37be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167079c48505d1272dc609cd94b9a21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/c198382e-fc39-4f0d-80f3-2253c3c41861.png?resizew=130)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1703c6a49c511f8f82123ff561d8e91.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62b21fc2745ff889b634f930b132757.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在平面直角坐标系中,四边形OABC的顶点坐标分别为O(0,0),A(6,0),B(4,3),C(0,3).动点P从点O出发,以每秒
个单位长度的速度沿边OA向终点A运动;动点Q从点B同时出发,以每秒1个单位长度的速度沿边BC向终点C运动.设运动的时间为t秒,PQ2=y.
(1)直接写出y关于t的函数解析式及t的取值范围: ;
(2)当PQ=
时,求t的值;
(3)连接OB交PQ于点D,若双曲线
(k≠0)经过点D,问k的值是否变化?若不变化,请求出k的值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)直接写出y关于t的函数解析式及t的取值范围: ;
(2)当PQ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(3)连接OB交PQ于点D,若双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7870fb0b0f49826ece4f6702bed798.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/87b86c48-92de-485c-a9a0-9bf4e5763b27.png?resizew=333)
您最近一年使用:0次