如图,⊙O是△ABC的外接圆,AD是⊙O的直径,连接CD,若⊙O的半径r=5,AC=
,
(1)求CD的长
(2)求∠B的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
(1)求CD的长
(2)求∠B的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/4c181204-0ebb-48d3-8107-41292420b869.png?resizew=195)
更新时间:2017-04-19 18:03:25
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【推荐1】【感知】如图①,在
中,点D为BC边上一点,连接AD,求证:
.
【类比】如图②,在图①的基础上,点P为AD上一点,且
,连接BP、CP,若
,则阴影部分图形的面积为______.
【拓展】如图③,在
中,
,
,
,点P为
内部一点,且
,则线段BP的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c54d8b9d12844f121f52fbb4aa7b54.png)
【类比】如图②,在图①的基础上,点P为AD上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc0534a30cbdd53b426d3e459ffc593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b96730ea2ea637aff39840559f51092.png)
【拓展】如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b3271085023945d5fbb9032efa646e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/5670e170-573f-4f4c-9d58-9ba04307215c.png?resizew=529)
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【推荐2】如图,AB=2,射线
,点P为BM上一点,以BP为直径作
,点D在
上,AD=AB,连接PD,点Q为弦PD上一点,射线QC交
于点E.
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982337555406848/2984908900057088/STEM/e4506f7f-8b57-4939-8379-5204ecd2320c.png?resizew=184)
(1)求证:AD为
的切线;
(2)若
,求劣弧
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c3e1e0e7938fcce6a0ecd70c14b480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982337555406848/2984908900057088/STEM/e4506f7f-8b57-4939-8379-5204ecd2320c.png?resizew=184)
(1)求证:AD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b8bfe060af1d9154606d4cdff84cee.png)
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名校
【推荐1】如图,
为
的直径,点
,
在
上,且点
是
的中点,过点
作
的垂线
交直线
于点
.
(1)求证:
是
的切线;
(2)连接
,若
,
,求线段
的长.
.
![](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/8455657dde27aabe6adb7b188e031c11.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/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2019/11/13/2333055511789568/2333182334550017/STEM/45680fcf8d1844f5a2cdaa3ea325f49a.png?resizew=148)
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【推荐2】如图,圆内接四边形
的对角线
,
交于点
,
平分
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/7be2a23c-d91c-4e72-b638-00bf253e025d.png?resizew=146)
(1)求
的大小;
(2)过点
作
交
的延长线于点
.若
,
,求圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acae4d38fbb3d4d0e5eff2cc720393c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/7be2a23c-d91c-4e72-b638-00bf253e025d.png?resizew=146)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc95af9238cf516b1f60fd4c51b409a.png)
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【推荐1】已知:如图,在
中,
,以
为直径的
与
交于点D,
,垂足为E,
的延长线与
的延长线交于点F.
(1)试说明:
是
的切线;
(2)若
的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/50c82020-6278-42a1-b5e0-969178bcec9c.png?resizew=149)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】以△ABC的边AC为直径的半圆交AB边于D点,∠A、∠B、∠C所对边长为a、b、c,且二次函数y=
(a+c)x2-bx+
(c-a)顶点在x轴上,a是方程z2+z-20=0的根.
(1)证明:∠ACB=90°;
(2)若设b=2x,弓形面积S弓形AED=S1,阴影面积为S2,求(S2-S1)与x的函数关系式;
(3)在(2)的条件下,当BD为何值时,(S2-S1)最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)证明:∠ACB=90°;
(2)若设b=2x,弓形面积S弓形AED=S1,阴影面积为S2,求(S2-S1)与x的函数关系式;
(3)在(2)的条件下,当BD为何值时,(S2-S1)最大?
![](https://img.xkw.com/dksih/QBM/2020/5/15/2463099981463552/2463800818458624/STEM/73e645f8522e47beabfe1d6f1d7ab606.png?resizew=153)
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