已知:如图,在锐角∠MAN的边AN上取一点B,以AB为直径的半圆O交AM于C,交∠MAN的角平分线于E,过点E作ED⊥AM,垂足为D,反向延长ED交AN于F.
(1)猜想ED与⊙O的位置关系,并说明理由;
(2)若cos∠MAN=
,AE=
,求阴影部分的面积.
(1)猜想ED与⊙O的位置关系,并说明理由;
(2)若cos∠MAN=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://img.xkw.com/dksih/QBM/2019/5/25/2211421112352768/2212954371366912/STEM/7db98b79e2a349919d17d977d6607816.png?resizew=208)
2011·四川达州·中考模拟 查看更多[2]
更新时间:2016-12-05 07:33:16
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【知识点】 求其他不规则图形的面积
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,
,
,
分别与
相切于E、F、G三点,且AB∥CD,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985624192221184/2988471219429376/STEM/9f585c43696e4e0ea81bfaa96a408800.png?resizew=191)
(1)求
的半径;
(2)求阴影部分面积
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef2010b44225d512da35649f01a95e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f68b399cb72e04ec9b03b25d475fa4d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985624192221184/2988471219429376/STEM/9f585c43696e4e0ea81bfaa96a408800.png?resizew=191)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
(2)求阴影部分面积
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
内接于
,
是
的直径,
的切线
交
的延长线于点
,
交
于点
,交
于点
,连接
.
是
的切线;
(2)若
的半径为
,求
的长;
(3)在(2)的条件下,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02309e614d719a634c2412956a16f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26093720ba425fbe5183230f4d12329e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在(2)的条件下,求阴影部分的面积.
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