如图,△ABD内接于⊙O,圆心O在边AB上,过点A的切线交BD的延长线于点C,E是⊙O上一点,连接AE交BD于点F,且AD平分∠EAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14351af7-9454-4ac5-95bf-08ab87901cdf.png?resizew=150)
(1)求证:DE=DA;
(2)若AE=
,tanE=
,求⊙O 的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14351af7-9454-4ac5-95bf-08ab87901cdf.png?resizew=150)
(1)求证:DE=DA;
(2)若AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39baaad79f0580fdb7624794accd2ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
更新时间:2022-06-26 21:46:29
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相似题推荐
解答题-证明题
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【推荐1】如图,已知:
,
,点
在
边上,且
.
(1)求证:
;
(2)如果
为
中点,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c226581e14091779321c9fe91160ceef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43fbec0095282673f0ff4fb2671d387e.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/e1b6c3002405379ad151defea457a695.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd651559bb5b2e0f8e0176219df135.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044d6f647bd9ffe03ce140cd1aba0755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3081d405e3066e17402105ebd7d1335f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/2/2755740997935104/2787330428518400/STEM/c6ce5c7c-51b5-45ac-bddf-c1dce29f477f.png)
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【推荐2】如图,在
中,
,点D是
的中点,以
为直径作
,分别交
,
于点E,F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/84983cea-3bc6-44cf-93a2-a08c606b1d83.png?resizew=171)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/84983cea-3bc6-44cf-93a2-a08c606b1d83.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-问答题
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【推荐1】如图,
是
的直径,弦
,垂足为点P,若
,
,求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/41a24590-a1c8-40f7-b5d9-00626d9b0c29.png?resizew=170)
(1)弦
的长度;
(2)弧
的长;
(3)弓形
的面积.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/41a24590-a1c8-40f7-b5d9-00626d9b0c29.png?resizew=170)
(1)弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)弓形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfaad4c4467e27421876d8f2a4371d2.png)
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名校
【推荐2】已知:在
中,
为直径,P为射线
上一点,过点P作
的切线,切点为点C,D为弧
上一点,连接
.
,求
的度数;
(2)如图2,若四边形
为平行四边形,
,求
的长.
![](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/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/172abdbc14be938fb9c9f9c8a70a8abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a1ec10c5722c58414d8d1bc401eb159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d8cad5b34e3269db5f683329111bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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解答题-证明题
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名校
【推荐1】如图,在
中,
,以
上一点
为圆心、
长为半径的圆与
相切于点
,分别交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/9/24/2556792716673024/2556923038285824/STEM/c2d4f4fb-e73c-43d3-9769-31a47616295f.png?resizew=262)
(1)若
连接
,求圆
的半径长;
(2)若
,求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149e83812e72efd7dd3dfc78d0134ae.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/ef4113c492885ba7c47fe42ac792578f.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/86cae7cc6665dc8edfb9060075b3afb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/2020/9/24/2556792716673024/2556923038285824/STEM/c2d4f4fb-e73c-43d3-9769-31a47616295f.png?resizew=262)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95d202fe324327b0bd4991794662081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c7f0d0987ee427b7efbbf889b9bf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
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解答题-作图题
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适中
(0.65)
名校
【推荐2】已知:
及
外一点
.求作:
的一条 切线,使这条切线经过点
.(尺规作图:保留作图痕迹,不写作法)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/830a25d9-8e48-4fd6-aafb-548e9834c599.png?resizew=162)
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解答题-证明题
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适中
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【推荐3】《几何原本》是古希腊数学家欧几里得所著的一部著作,它是欧洲数学的基础,总结了平面几何五大公设,被广泛地认为是历史上学习数学几何部分最成功的教科书.下面是其中的切割线定理:从圆外一点引圆的切线和割线,切线上是这点到割线与圆交点的两条线段长的比例中项,即如图①,
是
的切线,直线
为
的割线,则
.
下面是切割线定理的证明过程(不完整):
证明:如图②,连接
,连接
并延长交
于点E,连接
、
.
∵
是
的切线,
是
的半径,
∴
.
∵
是
的直径,∴
(__________),
∴
,∴__________.
∵
,∴__________.
∵
,∴
∽
,
∴
(__________),
∴
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/5e25e693-6dd7-43a3-9a3b-841470071cf4.png?resizew=126)
任务:
(1)请在横线上补充证明过程,在括号内补充推理的依据;
(2)如图③,已知
是
的直径,
是
的切线,A为切点,割线
与
于点E,且满足
,
,求
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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe4ca2c0c1e549aa53de2da13145eff.png)
下面是切割线定理的证明过程(不完整):
证明:如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34872e572042e7957a2739c3b9a8ebb7.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860a55cac2dc1655a7b8b38a6629ea76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8cb69fb2968f33cac6d21bb3036714.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5de441760160d31a0becf73383f2d7f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6836dffc0e4023e3b1dcb18e685827e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443b537d63cef031acb9a429d0a53090.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe4ca2c0c1e549aa53de2da13145eff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/4a72ee33-d607-4eb5-9047-9ca4b16feac0.png?resizew=146)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/f799c04c-e850-4428-869c-9c969257df32.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/5e25e693-6dd7-43a3-9a3b-841470071cf4.png?resizew=126)
任务:
(1)请在横线上补充证明过程,在括号内补充推理的依据;
(2)如图③,已知
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a6eb57a829b3f873c671c6158ce822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】(1)如图1,在矩形
中,
为
边上一点,连接
,
①若
,过
作
交
于点
,求证:
;
②若
时,则
______.
(2)如图2,在菱形
中,
,过
作
交
的延长线于点
,过
作
交
于点
,若
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80125e48498ac9c548732e2af1b1758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6607c1d1be275aa0d3d925bbd0b1e17f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916f0bf79cab9a0ed9f60176dc78fa66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9207a69d655849e6958adb701e1fda62.png)
(2)如图2,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf623a808eaaef1acef2bd44d92d34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,AB是半径⊙O的直径,弦AC与AB成30°角,且AC=CD.
![](https://img.xkw.com/dksih/QBM/2019/10/10/2308838961922048/2308928790913025/STEM/0b25bb36b388480fb062716621487359.png?resizew=139)
(1)求证:CD是⊙O的切线;
(2)若OA=2,求AC的长.
![](https://img.xkw.com/dksih/QBM/2019/10/10/2308838961922048/2308928790913025/STEM/0b25bb36b388480fb062716621487359.png?resizew=139)
(1)求证:CD是⊙O的切线;
(2)若OA=2,求AC的长.
您最近一年使用:0次