如图①,已知
的两条弦
,
相交于点M,
,设
的半径为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c3a9d1d2-9eba-4737-88d8-8a9814329315.png?resizew=302)
(1)求证:
;
(2)若
,
,求
的长;
(3)如图②,若
,
,设
,求证:
.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c3a9d1d2-9eba-4737-88d8-8a9814329315.png?resizew=302)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44f15980e155bcc8a6de771e771c782.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e575a6c0f341094c18999472df34e568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7551011cfb75b26f35b07d6617c6a18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(3)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff49273b4e3185be3e6842b2c6e51931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc53e22a2b4390597e86f260da9e373a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6887e06e94e85d7714001d3ea12bb4fa.png)
22-23九年级上·浙江杭州·期中 查看更多[4]
浙江省杭州市西湖区丰潭中学2022-2023学年九年级上学期期中数学试题(已下线)专题3.9 弧长及扇形的面积(能力提升)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(北师大版)浙江省杭州市临平区树兰实验学校2023-2024学年九年级上学期开学检测数学试题浙江省杭州市萧山区萧山区高桥初级中学2023-2024学年九年级上学期期中数学试题
更新时间:2022-11-08 15:01:16
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】数学课外活动小组外出社会实践,发现一块四边形草坪,经过实地测量,并记录数据,画出如图的四边形
,其中
米,
米,
.
;
(2)求四边形草坪造型的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bedaadb4e782586eb5f46048523b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c72eaa8cd96353848139df40a31b82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d5f49c0d6162ea6264c23fdff924cf.png)
(2)求四边形草坪造型的面积.
您最近一年使用:0次
解答题-应用题
|
适中
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【推荐2】综合与实践:
初步认识筝形后,实践小组动手制作了一个“筝形功能器”,如图,在笔形
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/627fdc94-58be-4425-a1aa-ba3e14f3cfb4.png?resizew=262)
(1)【操作应用】如图1,将“筝形功能器”上的点
与
的顶点
重合,
分别放置在角的两边
上,并过点
画射线
,求证:
是
的平分线;
(2)【实践拓展】实践小组尝试使用“筝形功能器”检测教室门框是否水平.如图2,在仪器上的点
处栓一条线绳,线绳另一端挂一个铅锤,仪器上的点
紧贴门框上方,观察发现线绳恰好经过点
,即判断门框是水平的.实践小组的判断对吗?请说明理由.
初步认识筝形后,实践小组动手制作了一个“筝形功能器”,如图,在笔形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7728e0e511ee3721ddac96919c4e2206.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/627fdc94-58be-4425-a1aa-ba3e14f3cfb4.png?resizew=262)
(1)【操作应用】如图1,将“筝形功能器”上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25021d77bda9550fdc5aeb5a352160d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21458395e4de266eef769d8ef7c0d875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25021d77bda9550fdc5aeb5a352160d.png)
(2)【实践拓展】实践小组尝试使用“筝形功能器”检测教室门框是否水平.如图2,在仪器上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
是
的直径,点A,C在
上,
,
交
于点E,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/5/bfeaf49e-084e-491f-99ec-9c8f8ee63a54.png?resizew=140)
(1)求
的度数,
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb32dae6823f572ffa028d684733c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8203794d21c8902041ccf79b3db1a69.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/5/bfeaf49e-084e-491f-99ec-9c8f8ee63a54.png?resizew=140)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c9c56e7fe6d14f52430cdf767205ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92fe336f5e4e1823903a6f937b9226ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:
为
的直径,
,
为
上一动点(不与
、
重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/4e6c7aea-0cee-4849-94a7-32b5452b7dc5.png?resizew=293)
(1)如图1,若
平分
,连接
交
于点
.①求证:
;②若
,求
的长;
(2)如图2,若
绕点
顺时针旋转
得
,连接
.求证:
为
的切线.
![](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/9995a90d542805442b8118206a4aa26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/4e6c7aea-0cee-4849-94a7-32b5452b7dc5.png?resizew=293)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42b59b76eafbbe36f13b2daa60132c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fc28f622892dd18bbbac95d541acfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】已知:如图,
为锐角三角形,
.
求作:点P,使得
,且
.
作法:①以点A为圆心,
长为半径画圆;
②以点B为圆心,
长为半径画弧,交
于点D(异于点C);
③连接
并延长交
于点P.
所以点P就是所求作的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/646ba752-9c92-436a-b4ab-32091d889437.png?resizew=85)
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹):
(2)完成下面的证明.
证明:连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
∵
,
∴点C在
上.
又∵
,
∴
(________________________)(填推理的依据),
由作图可知,
,
∴
(________________________)(填推理的依据)
________.
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
求作:点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc61de08bda0c44e06ad89d306c0bb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f431b0b0c2ceecc2c91f42745e0abe39.png)
作法:①以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
所以点P就是所求作的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/646ba752-9c92-436a-b4ab-32091d889437.png?resizew=85)
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹):
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
∴点C在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c968117e624960e233fc72d7470fce.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c85faa4aa66908ca5c20f0c128ed998.png)
由作图可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e0e4e357c531e96cbccaa6f2b848c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360273eee210dc27acf026f26e7a2a78.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f431b0b0c2ceecc2c91f42745e0abe39.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知
的直径
弦
于点
,且
是
的中点,连接
并延长交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611943207985152/2621816080105472/STEM/e011e1070873408f8f9f401015bf947a.png?resizew=131)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611943207985152/2621816080105472/STEM/e011e1070873408f8f9f401015bf947a.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】(1)【问题呈现】阿基米德折弦定理:如图1,
和
是
的两条弦(即折线
是圆的一条折弦),
,点
是
的中点,则从
向
所作垂线的垂足
是折弦
的中点,即
.下面是运用“截长法”证明
的部分证明过程.
证明:如图2,在
上截取
,连接
和
,
是
的中点,
∴
,
∴
①,
又∵
②,
,
,
又
,
,
,即
,
根据证明过程,完成下列步骤:
① ,② .
(2)【理解运用】如图1,
是
的两条弦,
,
点
是
的中点,
于点
,则
的长为_____.
(3)【变式探究】如图3,若点
是
的中点,【问题呈现】中的其他条件不变,判断
之间存在怎样的数量关系?并加以证明.
(4)【实践应用】根据你对阿基米德折弦定理的理解完成下列问题:
如图4,
是
的直径,点
圆上一定点,点
圆上一动点,且满足
,若
,
的半径为10,求
长.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c4e3cf5aa65a81a357c97a6b7ee5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9674f2928200a20a3ed306e526733668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9674f2928200a20a3ed306e526733668.png)
证明:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73032c21673ec4f9d52452da366e7828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355943171ef13621e55c09574d8c18ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1da7f29dc98b6afd09d0676dc75909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2086c7896d5eaeeb9a128b844e089cad.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048bb40304b45c5be0b98de9183e4292.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6abf158aa8020ec8c77f5588196118c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72396e2e79001cfd8407c656afc65612.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d791fdd3324d85af02e960a388040fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008476e06c2048353f30fd7f9f3cdbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67201d0f284766432d8f687c0791c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9674f2928200a20a3ed306e526733668.png)
根据证明过程,完成下列步骤:
① ,② .
(2)【理解运用】如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1242442b9c78d4fcbb856e9db041bd8.png)
点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4d54b7ff95f2bb56fc6f7979fae83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)【变式探究】如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c41b3b1c3c5764b61e71a947628593.png)
(4)【实践应用】根据你对阿基米德折弦定理的理解完成下列问题:
如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ed407cbb778f76bf879bfcae69ebba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/8edcf930-0ed7-41ce-b94d-e5ca599c11f7.jpg?resizew=524)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知AB为⊙O的直径,AC为⊙O的切线,连接CO,过B作
交⊙O于D,连接AD交OC于G,延长AB、CD交于点E.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644218929152/2969222404644864/STEM/0507c9347d3943d5b3f02501b40c81de.png?resizew=163)
(1)求证:CD是⊙O的切线;
(2)若BE=4,DE=8,求CD的长;
(3)在(2)的条件下,连接BC交AD于F,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4e4cd96319820b5c6eb35bf7d94501.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644218929152/2969222404644864/STEM/0507c9347d3943d5b3f02501b40c81de.png?resizew=163)
(1)求证:CD是⊙O的切线;
(2)若BE=4,DE=8,求CD的长;
(3)在(2)的条件下,连接BC交AD于F,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52fa34269595fb910a27edb294e642e1.png)
您最近一年使用:0次