如图,
是
的外接圆,
是
的直径,点D在
上,
,连接
,延长
交过点C的切线于点E.
;
(2)求证:
;
(3)若
的长为 ___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d61f97529ed6945c4fa6219867189a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9e8c0413a229d3fbbf53f950c80e59.png)
23-24九年级上·青海海东·期末 查看更多[3]
更新时间:2024-06-05 14:46:28
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相似题推荐
解答题-问答题
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名校
【推荐1】如图1,以△ABC的边AB为直径的⊙O交边BC于点E,过点E作⊙O的切线交AC于点D,且ED⊥AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d6e65a68-1ffb-46d3-9140-5fea65df19f8.png?resizew=290)
(1)试判断△ABC的形状,并说明理由;
(2)如图2,若线段AB、DE的延长线交于点F,∠C=75°,CD=2﹣
,求⊙O的半径和BF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d6e65a68-1ffb-46d3-9140-5fea65df19f8.png?resizew=290)
(1)试判断△ABC的形状,并说明理由;
(2)如图2,若线段AB、DE的延长线交于点F,∠C=75°,CD=2﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】已知:如图,
中,
,E在
的延长线上,
.若
,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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c79c4d655d22f6b3e9826adc6df810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/be99f508-0ce2-4c83-8074-008cebd8ba69.png?resizew=221)
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【推荐1】一次数学综合实践活动中,聪明的小倩同学发现关于三角形角平分线的一个结论.如图,已知
是三角形
的角平分线,可以得到
.小倩同学的证明思路是这样的:如图,过点C作
,交
的延长线与点E,通过三角形的相似可以证明
.
(1)请根据小倩同学的思路,写出证明该结论的过程.
(2)利用以上结论进行计算:在图1中,已知
,则
______.
(3)在图3中,已知
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126fdae0b1adc7361f945187b861fb20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/51547a49-cc60-43f9-9b03-51cf59e814da.png?resizew=502)
(1)请根据小倩同学的思路,写出证明该结论的过程.
(2)利用以上结论进行计算:在图1中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471323f2298e7cb440b3932daa62049d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
(3)在图3中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40286243fed77af8357208b3a72e0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图1,长方形
的边
分别在x轴、y轴上,B点坐标是
,将
沿对角线
翻折得
,
与
相交于点E.
(1)求证:
;
(2)求E点坐标;
(3)如图2,动点P从点A出发,沿着折线A→B→C→O运动(到点O停止),是否存在点P,使得
的面积等于四边形
面积的一半,若存在,请求出点P坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132de9682ce9a412b7b517aa209726ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6133ef940cb405ad07fc849df06bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee05fdbfca9281f1eb74e11c8144938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/5b247783-e117-49c2-b68b-fe56b359e712.png?resizew=320)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a801ad8e9e9ba6a0846868b6229e7fb8.png)
(2)求E点坐标;
(3)如图2,动点P从点A出发,沿着折线A→B→C→O运动(到点O停止),是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e534b545e86c02abd2a0dc75d32b407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9743217ef514bbcd308ea14bdc16259.png)
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【推荐1】如图,AB为⊙O的直径,点C,D为
上的点,且
=
,延长AD,BC相交于点E,连接OD交AC于点F.
(1)求证:△ABC≌△AEC;
(2)若OA=3,BC=4,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8166469b31420fb93f0ede2ed96b5c4f.png)
(1)求证:△ABC≌△AEC;
(2)若OA=3,BC=4,求AD的长.
![](https://img.xkw.com/dksih/QBM/2020/3/5/2413156183572480/2413856637149184/STEM/fe948282d10a4379abf4699ef51265df.png?resizew=146)
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【推荐2】如图,
为
的直径,点E在
上,C为弧
的中点,过点C作直线
于D,连接
,
,试判断直线
与
的位置关系,并说明理由.
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/2/fb33ad53-a0dd-4a07-90e3-762776032558.jpg?resizew=156)
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【推荐1】如图,
的两个顶点
、
都在反比例函数
的图像上,
经过原点
.斜边
垂直于
轴,垂足为
.已知点
的坐标为
.
和反比例函数的解析式;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7385795d7eab9691e21172c51a97428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e494da0b5dcdb6feada8ad245fabea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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真题
【推荐2】已知
是
的直径,弦
平分
,
于
,
于E.
(1)求证:
是
的切线;
(2)求证:
.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747b39200899e6cf90e3e4a4bd002567.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/deb94dd6-febc-42f4-b7c4-294578966729.png?resizew=137)
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