如图,
是
的弦,半径
,垂足为
,交
延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/cb3b2b90-205f-4d16-98f6-2d112bc534a0.png?resizew=134)
(1)求证:
是
的中点;
(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/6cee097d4fe948c3d4f1b5c28b24adf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d8205e71c922ad9e168541e37bd6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/cb3b2b90-205f-4d16-98f6-2d112bc534a0.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b32167424064511aa8224c78e06e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2024-03-13 19:50:41
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知矩形
,将其绕着点
逆时针旋转得到矩形
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/d0102cf2-1bea-4300-8187-74d1961b0c28.png?resizew=389)
(1)如图1,若点
在
上,连接
.
①求证:
平分
;
②连接
交
于点
,若
,
,求
的长.
(2)如图2,若点
,
,
在同一条直线上,
与
交于点
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/d0102cf2-1bea-4300-8187-74d1961b0c28.png?resizew=389)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
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名校
【推荐2】如图1,在
中,过点C作
于点D,过
上一点F作
于点F,交
于点H,交
于E,且
.
(1)若
,且
,求线段
的长.
(2)如图2,过E作
与点G,连接
,求证,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7044476eb6e90a781518c230f4637bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e803780fc678e4121636018760f6e4e1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df049f15adb6667113ceee3a6638cd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca669a2f745677934f4267b248340fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图2,过E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827beb23a9fe02a8b588645bcb82ce67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c9cf7b716ae4a786845a4d7b931072.png)
![](https://img.xkw.com/dksih/QBM/2020/12/12/2619579670052864/2620618178297856/STEM/27a8e906-576f-4f36-a5af-3e8c421dc3b4.png?resizew=551)
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解答题-计算题
|
适中
(0.65)
【推荐1】如图,在
中,过半径OD中点C作AB⊥OD交O于A,B两点,且
.
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374957571440640/2375002811056128/STEM/2b52eb29e0844bba86e74b4791cc5733.png?resizew=144)
(1)求OD的长;
(2)计算阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374957571440640/2375002811056128/STEM/2b52eb29e0844bba86e74b4791cc5733.png?resizew=144)
(1)求OD的长;
(2)计算阴影部分的面积.
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解答题-作图题
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适中
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名校
【推荐2】已知等腰三角形
中,
.
(1)用直尺和圆规作出
的外接圆
;(保留作图痕迹,不写作法)
(2)若
,
,求
的外接圆半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/92847da2-0030-473b-b094-c081aaafb8a5.png?resizew=142)
(1)用直尺和圆规作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8b65efe27c217040c135d9e3111aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86cf51378ccec9eae5723f343ca7ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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解答题-证明题
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【推荐1】在扇形
中,
,点
在
上,且
,点
在半径
上,以
,
为邻边作平行四边形
,当点
,
,
共线时,
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806681068929024/2810958330224640/STEM/8215e171-e6b3-4e99-9fc7-1ec557f7078f.png?resizew=236)
(1)求
的度数;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed01d1ff5a7f21a68fb3a1e5c7f393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79684a6e92297749c005e2b23cac9710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97c6d27e5d4d8d0e7b7ad6d5341abd5.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/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd0c620208b6c69d573ec60826b33ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806681068929024/2810958330224640/STEM/8215e171-e6b3-4e99-9fc7-1ec557f7078f.png?resizew=236)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e152c7ab6ce9602ca73d5da3f0fa1d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44483feef9a342478d375731ffc2386.png)
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解答题-证明题
|
适中
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【推荐2】请阅读下列材料,并完成相应的任务.
阿基米德折弦定理
阿基米德(Archimedes,公元前287~公元212年,古希腊是有史以来最伟大的数学家之一,他与牛顿、高斯并称为三大数学王子.
阿拉伯Al-Biruni(973年-1050年)的译文中保存了阿基米德折弦定理的内容,苏联在1964年根据Al-Biruni译本出版了俄文版《阿基米德全集》,第一题就是阿基米德的折弦定理.
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),
,
是
的中点,则从点
向
所作垂线的垂足
是折弦
的中点,即
,
![](https://img.xkw.com/dksih/QBM/2021/6/7/2737765492547584/2739165825835008/STEM/6cf42055da4b4f4db53501773f50bf4c.png?resizew=554)
下面是运用“补短法”证明
的部分证明过程.
证明:如图2,延长
到点F,使得
,连接DA,DB,DC和DF.
∵
是
的中点
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
…
任务:
(1)请按照上面的证明思路,写出该证明的剩余部分:
(2)填空:如图3,已知等边
内接于
,
,
为
上一点,
.
于点
,则
的周长是______.
阿基米德折弦定理
阿基米德(Archimedes,公元前287~公元212年,古希腊是有史以来最伟大的数学家之一,他与牛顿、高斯并称为三大数学王子.
阿拉伯Al-Biruni(973年-1050年)的译文中保存了阿基米德折弦定理的内容,苏联在1964年根据Al-Biruni译本出版了俄文版《阿基米德全集》,第一题就是阿基米德的折弦定理.
阿基米德折弦定理:如图1,
![](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/f2da1d50433aecf541991fd0f01773cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7f4811bd58b21f66b4fe114152d14.png)
![](https://img.xkw.com/dksih/QBM/2021/6/7/2737765492547584/2739165825835008/STEM/6cf42055da4b4f4db53501773f50bf4c.png?resizew=554)
下面是运用“补短法”证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7f4811bd58b21f66b4fe114152d14.png)
证明:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607cfabc1d421835b6b64109ad18f571.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
…
任务:
(1)请按照上面的证明思路,写出该证明的剩余部分:
(2)填空:如图3,已知等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/5b03bf58cba56d1b98a8a457982870b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61588617d22abd00af4ca489bb3a8787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
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