如图,
是
的直径,点C为
上一点,D为弧
的中点,过D作
于点E,交
于点F,交弦
于点G,连接
,
.
![](https://img.xkw.com/dksih/QBM/2022/11/27/3118535830437888/3120186548142080/STEM/387f4eaacbba4663894dd169e380eb4e.png?resizew=162)
(1)求证:
.
(2)若
,
,求
的半径.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2022/11/27/3118535830437888/3120186548142080/STEM/387f4eaacbba4663894dd169e380eb4e.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47a70a2811c174e73ce1beeb80c75c1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2022-11-29 18:18:41
|
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,
是
的直径,
是
弦,
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/dcd1c505-8d19-4953-b878-5360d94345bf.png?resizew=129)
(1)请写出三个不同类型的正确结论;
(2)连结
,设
,
,试找出
与
之间的一种关系式并给予证明.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c06c935db45144d8917a2d4944ca4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/dcd1c505-8d19-4953-b878-5360d94345bf.png?resizew=129)
(1)请写出三个不同类型的正确结论;
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec66384de001ccfd86e935ddcfe1033d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b745b104d14c796fe555890201591b.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,有一座圆弧形拱桥,它的跨度
为
,拱高
为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857aaa8fc6074c0d499298451e4e737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
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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⊙O中,弦AB,CD相交于点P,且PB=PD.
求证:AB=CD.
求证:AB=CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/743754d6-3575-48de-8f18-c0838e0a689d.png?resizew=145)
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
中,
为直径,P为
上一点,
,过点P的弦
,Q为
弧上一动点(与点B、C不重合),
,垂足为H.连接
.
(1)求
的长;
(2)在点Q的运动过程中,
的值是否发生变化?若变化求出取值范围,若不变化,求出比值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1fbb4e0f2e83935f5e4d3e75065c573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/1097434d-a134-46ec-b7bb-c3b159a810b9.png?resizew=148)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)在点Q的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40bdf4a6f10dcd045089c5440cb65ebb.png)
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