如图,点A,B,C是半径为3的
上三个点,
为直径,
的平分线交圆于点D,过点D作
的垂线交
的延长线于点E,延长
交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/f2c2725a-499b-485d-a92f-ab6b69024c22.png?resizew=168)
(1)判断直线
与
的位置关系,并证明.
(2)若
,求
的值.
![](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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/f2c2725a-499b-485d-a92f-ab6b69024c22.png?resizew=168)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e8d0a44969df78c85792d5d2ba4861.png)
更新时间:2023-03-19 17:21:57
|
相似题推荐
解答题-问答题
|
适中
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名校
【推荐1】如图1,扇形
中,
,
,点P在半径
上,连接
.
(1)把
沿
翻折,点O的对称点为点Q.
① 当点Q刚好落在弧
上,求弧
的长;
② 如图2,点Q落在扇形
外,
与弧
交于点C,过点Q作
,垂足为 H,
、求
的长;
(2)如图3,记扇形
在直线
上方的部分为图形W,把图形W沿着
翻折,点B的对称点为点E,弧
与
交于点F,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fdfc5de955e8a91aab5e6f1a15f8896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64182e7ddde51fb583460923c7c99db2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/9b8921cc-816e-4f0d-85bc-89b656e15df1.jpg?resizew=377)
(1)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
① 当点Q刚好落在弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
② 如图2,点Q落在扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dec65adfb09989246093ab5a349d8d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a4f4daf24660d04a65309398890af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图3,记扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4beab0255dd6f78532622e1f0a69c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
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【推荐2】如图,在四边形ABCD中,AB=AD=8,∠A=60°,∠ADC=150°,四边形ABCD的周长为32.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6dd3e8bf-ff5e-454d-bf3a-06417535efde.jpg?resizew=144)
(1)∠BDC度数;
(2)BC、CD的长;
(3)四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6dd3e8bf-ff5e-454d-bf3a-06417535efde.jpg?resizew=144)
(1)∠BDC度数;
(2)BC、CD的长;
(3)四边形ABCD的面积.
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC于点D,过点D作MN⊥AC,垂足为M,交AB的延长线于点N,过点B作BG⊥MN,垂足为G,连接CM.
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964154349395968/2967194739195904/STEM/a82f73bb327f4cc4a5a5a969e7f38e6f.png?resizew=213)
(1)求证:直线MN是⊙O的切线;
(2)求证:BD2=AC•BG;
(3)若BN=OB,⊙O的半径为1,求tan∠ANC的值.
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964154349395968/2967194739195904/STEM/a82f73bb327f4cc4a5a5a969e7f38e6f.png?resizew=213)
(1)求证:直线MN是⊙O的切线;
(2)求证:BD2=AC•BG;
(3)若BN=OB,⊙O的半径为1,求tan∠ANC的值.
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【推荐2】如图,在圆内接四边形
中,
为
的直径,点
关于
的对称点
在边
上,连接
并延长
交
于点
,圆心
在
上,过点
作
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/f3fbde0a-c456-4246-b683-fd43a89e6011.png?resizew=143)
(1)求证
为
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44db8d7bd585ca42f1b32d3d31aa47d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/f3fbde0a-c456-4246-b683-fd43a89e6011.png?resizew=143)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d2f2e41907e30a4a14035f55e3c37c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解题方法
【推荐1】如图,在△ABC中,
,
是
的平分线,
的平分线
交
于点
,点
在
上,以点
为圆心,
的长为半径的圆经过点
,交
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490765023223808/2490804018642944/STEM/307bad4aaafe41c78a22f496fdc63806.png?resizew=201)
(1)求证:
为⊙O的切线;
(2)当
,
时,求⊙O的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/b90e0f35eda1a729fed485f83da5ea9d.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490765023223808/2490804018642944/STEM/307bad4aaafe41c78a22f496fdc63806.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
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【推荐2】![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/86661ade-fb7c-4a7f-941c-419e9e921352.png?resizew=384)
【问题背景】
(1)如图1,点B,C,D在同一直线上,
,求证:
;
【问题探究】
(2)在(1)条件下,若点C为
的中点,求证:
;
【拓展运用】
(3)如图2,在
中,
,点O是
的内心,若
,
,则
的长为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/86661ade-fb7c-4a7f-941c-419e9e921352.png?resizew=384)
【问题背景】
(1)如图1,点B,C,D在同一直线上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca25fc6bdeef740a0d0a904deaef0247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cbf2262267d64aadbb9f51b599ddb2.png)
【问题探究】
(2)在(1)条件下,若点C为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce552140d3d4944180b2643a2114b024.png)
【拓展运用】
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e001897d70ceee81406f3b01d284b83b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e5c5f517b79d3025279965febbe14c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,
为
的直径,弦
于点H,
的切线
与
的延长线交于点E,
,
与
的交点为F.
;
(2)若
的半径为6,
,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/8b757f0c42ae5c9a2d6a4b19e5877b27.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2742e11fc7d28fc674537e11d09d042c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bc0cc876a60c8cbdccc6a9a0b5b993.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d881761c0f9cf2f9129c68b7600610af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
为
的切线,A为切点,过A作
的垂线
,垂足为点C交
于点B,延长
与
交于点D,与
的延长线交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/e2434b1f-a2e9-49d1-bd3e-3a78dbe45d0c.png?resizew=138)
(1)求证:
为
的切线;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.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/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/e2434b1f-a2e9-49d1-bd3e-3a78dbe45d0c.png?resizew=138)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60eeb5056524c4cb23c35cc30dc49b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f568aad98cca897c248253364fc8e067.png)
您最近一年使用:0次