课本改编
(1)如图1,四边形
为
的内接四边形,
为
的直径,则
度,
度.
(2)如果
的内接四边形
的对角线
不是
的直径,如图2,求证:圆内接四边形的对角互补.
知识运用
(3)如图3,等腰三角形
的腰
是
的直径,底边和另一条腰分别与
交于点 D,E,F 是线段
的中点,连接
,求证:
是
的切线.
(1)如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/afde09d82ae96f00c135732baee64776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7960538cb70fcf641b94864a90190d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10d96f74897c4aa582d7e41c5c4e7a0.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
知识运用
(3)如图3,等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
2024·江西九江·一模 查看更多[2]
更新时间:2024-04-27 09:50:27
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在Rt△ABC中,∠ACB=90°,现将Rt△ABC绕点C逆时针旋转90°,得到Rt△DEC(如图①)
![](https://img.xkw.com/dksih/QBM/2016/1/25/1573962635878400/1573962642325504/STEM/6e1cbf05ee9f41a193fe7f0bfc646d93.png)
(1)请判断ED与AB的位置关系,并说明理由.
(2)如图②,将Rt△DEC沿CB方向向右平移,且使点D恰好落在AB边上,记平移后的三角形为Rt△DEF,连接AE、DC,求证:∠ACD=∠AED.
![](https://img.xkw.com/dksih/QBM/2016/1/25/1573962635878400/1573962642325504/STEM/6e1cbf05ee9f41a193fe7f0bfc646d93.png)
(1)请判断ED与AB的位置关系,并说明理由.
(2)如图②,将Rt△DEC沿CB方向向右平移,且使点D恰好落在AB边上,记平移后的三角形为Rt△DEF,连接AE、DC,求证:∠ACD=∠AED.
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解答题-证明题
|
适中
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【推荐2】在探究“四点共圆的条件”的数学活动课上,小霞小组通过探究得出:在平面内,一组对角互补的四边形的四个顶点共圆.请应用此结论.解决以下问题:
如图1,
中,
.点D是边上的一动点(点D不与B,C重合),将线段
绕点A顺时针旋转
得到线段
,连接
.
(2)如图2,当
时,
是四边形
的外接圆,求证:
是
的切线.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed769090441cc538ff24930defaa8042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,
弦
于点
,交
于点
,连结
、
、
,若
.
求证:直线
为
的切线;
若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b730eaca93ece932369e23f619942bda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb490e423f063b47b453fa3edf301f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b36a1938df65db2b68bf7595b97bafa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9f0779b0ba2f9f97caf35c166ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076823211335680/2080121487687680/STEM/ca30033b8eae41ba8a4838c68ca1bc9e.png?resizew=93)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图1,
内接于⊙O,
,D为
上一点,
交
延长线于点E.
为
的切线;
(2)如图2,连接
恰好过圆心,过点A作
于G,过点C作
于F.
①求证:
;
②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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823b421ffc231eaa1e6dd9d3e6ef169b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bad3d9422cf9c0b078900b3c507e87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac18b0388014ae20b2add2975ef56aa.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef7b745016d59c0edb26bc64c4f5f8b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76839a80ac2e7fc7a52055528b77fd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
,
,
,将
绕点B顺时针旋转一定的角度得到
,点A,C的对应点分别是D,E,连接
.
(1)如图1,当点E恰好在边
上时,求
的大小;
(2)如图2,若F为
中点,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/4cc9bb9c-ddc9-497e-8b26-e5aaf0d4ec9f.png?resizew=384)
(1)如图1,当点E恰好在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(2)如图2,若F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】菱形ABCD中,两条对角线AC、BD相交于点O,点E和点F分别是BC和CD上一动点,且∠EOF+∠BCD=180°,连接EF.
![](https://img.xkw.com/dksih/QBM/2016/9/22/1574239770099712/1574239776776192/STEM/c5d9c05cebad45339fc5a71055ff6882.png)
(1)如图2,当∠ABC=60°时,猜想三条线段CE、CF、AB之间的数量关系 ;
(2)如图1,当∠ABC=90°时,若AC=4
,BE=
,求线段EF的长;
(3)如图3,当∠ABC=90°,将∠EOF的顶点移到AO上任意一点O′处,∠EO′F绕点O′旋转,仍满足∠EO′F+∠BCD=180°,O′E交BC的延长线一点E,射线O′F交CD的延长线上一点F,连接EF探究在整个运动变化过程中,线段CE、CF,O′C之间满足的数量关系,请直接写出你的结论.
![](https://img.xkw.com/dksih/QBM/2016/9/22/1574239770099712/1574239776776192/STEM/c5d9c05cebad45339fc5a71055ff6882.png)
(1)如图2,当∠ABC=60°时,猜想三条线段CE、CF、AB之间的数量关系 ;
(2)如图1,当∠ABC=90°时,若AC=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)如图3,当∠ABC=90°,将∠EOF的顶点移到AO上任意一点O′处,∠EO′F绕点O′旋转,仍满足∠EO′F+∠BCD=180°,O′E交BC的延长线一点E,射线O′F交CD的延长线上一点F,连接EF探究在整个运动变化过程中,线段CE、CF,O′C之间满足的数量关系,请直接写出你的结论.
您最近一年使用:0次