如图,⊙O的弦AD∥BC,过点D的切线交BC的延长线于点E,AC∥DE交BD于点H,DO及延长线分别交AC、BC于点G、F.
(1)求证:DF垂直平分AC;
(2)求证:FC=CE;
(3)若弦AD=5cm,AC=8cm,求⊙O的半径.
(1)求证:DF垂直平分AC;
(2)求证:FC=CE;
(3)若弦AD=5cm,AC=8cm,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2019/3/19/2163807341068288/2168130549358592/STEM/79e00191f5f1412686d8fbc559fc268d.png?resizew=259)
2012·浙江金华·一模 查看更多[8]
(已下线)2012届浙江义乌七校初中毕业生学业考试联合模拟数学试卷2018年秋九年级上学期数学第二十四章检测题(已下线)2018届九年级下册第2章数学综合测评卷【校级联考】安徽省黄山市休宁县六校联考2018届九年级(上)期中数学试卷四川省成都市武侯区第七中学2018-2019学年度第二学期第三次月考数学试题天津市滨海新区2019-2020学年九年级上学期期中数学试题2020年江苏省东海晶都双语学校九年级上学期期末模拟数学试题2022年山东省济南市初中学业水平考试数学模拟卷二
更新时间:2016-12-05 11:20:56
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知AT切圆O于点T,点B在圆O上,且
,连接AB并延长交圆O于点C,圆O的半径为2,若AT的长恰好为2.
(1)求证:△BOC是等腰直角三角形;
(2)求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7475fd7b1e0d76b7faa174e387d88b9b.png)
(1)求证:△BOC是等腰直角三角形;
(2)求AC的长.
![](https://img.xkw.com/dksih/QBM/2020/4/30/2459220788592640/2461682673696768/STEM/2e8b041f3d0045eabadd99c50c6fb96e.png?resizew=167)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四边形
内接于
,
为
的直径,点
为
的中点,对角线
,
交于点
,
的切线
交
的延长线于点
,切点为
.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/527acc59-832b-44ae-8c2f-25c52040cd7f.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495be6a6b940e8affe38f2bcdee246b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed650e192b6e94b4a99c05fb9ea93c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次