如图,在
中,
,
为
的直径,
分别交
,
于点D,E,过点E作
垂直
于点F,连结
.
![](https://img.xkw.com/dksih/QBM/2023/6/19/3263205779243008/3263562235617280/STEM/0e96ba8827864185adde6d31ded94922.png?resizew=208)
(1)若
,求
的度数;
(2)若
,求
的长;
(3)请根据题目条件写出一个结论,并尝试证明你的结论.
![](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/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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2023/6/19/3263205779243008/3263562235617280/STEM/0e96ba8827864185adde6d31ded94922.png?resizew=208)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4b7c42041d558f0bf239ddced95ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)请根据题目条件写出一个结论,并尝试证明你的结论.
2023·浙江·一模 查看更多[1]
更新时间:2023-06-20 07:57:16
|
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在Rt△ABC中,∠ACB=90°,E是BC的中点,以AC为直径的⊙O与AB边交于点D,连接DE.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893007878856704/2928993875353600/STEM/4aa19708-0ac2-4749-827d-73df163f19d5.png?resizew=249)
(1)求证:DE是⊙O的切线;
(2)若CD=3cm,
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解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,△ABC为⊙O的内接三角形,AB为⊙O的直径,过点A作⊙O的切线交BC的延长线于点D.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2460724667924480/2461378665349120/STEM/76bb59d7-ec4c-4470-820b-744a419fbcef.png)
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AD;
(3)若点F为直径AB下方半圆的中点,连接CF交AB于点G,且AD=6,AB=3,求CG的长.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2460724667924480/2461378665349120/STEM/76bb59d7-ec4c-4470-820b-744a419fbcef.png)
(1)求证:△DAC∽△DBA;
(2)过点C作⊙O的切线CE交AD于点E,求证:CE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)若点F为直径AB下方半圆的中点,连接CF交AB于点G,且AD=6,AB=3,求CG的长.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在△ABC中,点D在边BC上,∠CAD=∠B,点E在边AB上,联结CE交AD于点H,点F在CE上,且满足CF•CE=CD•BC.
(1)求证:△ACF∽△ECA;
(2)当CE平分∠ACB时,求证:
=
.
(1)求证:△ACF∽△ECA;
(2)当CE平分∠ACB时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15abb8dda702fa944537ee18e94815a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0255ce3e1ba26fca432dd4e3de6b1e.png)
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解答题-证明题
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适中
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【推荐1】如图,在四边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
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解答题-问答题
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点,
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于点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316779774164992/2316938174038016/STEM/3d85d09801fa4a88bc2640ddf89bf116.png?resizew=175)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,AB,CD是
的直径,点F是AD延长线上一点,且
于点E,交
于点G.
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733786313883648/2734197314019328/STEM/32a4a163b304496db28db3dc4da03065.png?resizew=210)
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.
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733786313883648/2734197314019328/STEM/32a4a163b304496db28db3dc4da03065.png?resizew=210)
(1)求证:
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(2)若
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知锐角三角形
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,
,
.作
的外接圆
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于点F,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/afdbeecc-917e-43e1-9b5f-2be956104cdc.png?resizew=132)
(1)求证:
.
(2)若
,
,
①求
的取值范围.
②求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/afdbeecc-917e-43e1-9b5f-2be956104cdc.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916aa68e47334ba3b95cd7d99f67c6b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7aafc14893896f4f908f2deb53c9f65.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
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