如图,已知⊙O为△ABC(∠A<∠ABC)的外接圆,且AB为
的直径,AB=8,点D为AB延长线上一点,点 E为半径OB上一点,连接CD、CE、OC,且∠BCD=∠A.
![](https://img.xkw.com/dksih/QBM/2019/7/5/2240499903987712/2243017436741632/STEM/250279c31c20459bbc190557007e5bd6.png?resizew=189)
(1)求证:CD为
的切线;
(2)若CB=CE,求证:CE2=CO2-OA·OE;
(3)在(2)的条件下,求OE+BC的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0b9d36c7abf2b4735d7cbce6a16a4d.png)
![](https://img.xkw.com/dksih/QBM/2019/7/5/2240499903987712/2243017436741632/STEM/250279c31c20459bbc190557007e5bd6.png?resizew=189)
(1)求证:CD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0b9d36c7abf2b4735d7cbce6a16a4d.png)
(2)若CB=CE,求证:CE2=CO2-OA·OE;
(3)在(2)的条件下,求OE+BC的最大值.
更新时间:2019-07-09 10:53:34
|
相似题推荐
解答题-证明题
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真题
【推荐1】如图,
是
的直径,点D在
上,
的延长线与过点B的切线交于点C,E为线段
上的点,过点E的弦
于点H.
;
(2)已知
,
,且
,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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd9aaf21eedf6e0de26be238d0763da.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/121e9b7080514f5a33858d72e28d60a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解题方法
【推荐2】如图,
是
的直径,
,
是
的两条切线,点A,C为切点,延长
,
相交于点D,若
,
,点F为弧
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/c19c2b6c-3d05-41a9-9913-f0a86380e4b1.png?resizew=370)
(1)连接
交
于点M,求证:
;
(2)设
,求
的值;
(3)若点G与点F关于圆心O对称,连接
,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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/c19c2b6c-3d05-41a9-9913-f0a86380e4b1.png?resizew=370)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea406fc5be3d6acea9014c6fa24d514.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21de7f515e12c744e016229454aa9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(3)若点G与点F关于圆心O对称,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐3】在平面直角坐标系xOy中,点P和点P'关于y=x轴对称,点Q和点P'关于R(a,0)中心对称,则称点Q是点P关于y=x轴,点R(a,0)的“轴中对称点”.
(1)如图1,已知点A(0,1).
①若点B是点A关于y=x轴,点G(3,0)的“轴中对称点”,则点B的坐标为 ;
②若点C(-3,0)是点A关于y=x轴,点R(a,0)的“轴中对称点”,则a= ;
(2)如图2,⊙O的半径为1,若⊙O上存在点M,使得点M'是点M关于y=x轴,点T(b,0)的“轴中对称点”,且点M'在射线y=x-4(x
4)上.
①⊙O上的点M关于y=x轴对称时,对称点组成的图形是 ;
②求b的取值范围;
(3)⊙E的半径为2,点E(0,t)是y轴上的动点,若⊙E上存在点N,使得点N'是点N关于y=x轴,点(2,0)的“轴中对称点”,并且N'在直线
上,请直接写出t的取值范围.
![](https://img.xkw.com/dksih/QBM/2017/6/9/1705263352119296/1706182285500416/STEM/a68cf23d8ad94045b71be81fe9797c6b.png?resizew=548)
(1)如图1,已知点A(0,1).
①若点B是点A关于y=x轴,点G(3,0)的“轴中对称点”,则点B的坐标为 ;
②若点C(-3,0)是点A关于y=x轴,点R(a,0)的“轴中对称点”,则a= ;
(2)如图2,⊙O的半径为1,若⊙O上存在点M,使得点M'是点M关于y=x轴,点T(b,0)的“轴中对称点”,且点M'在射线y=x-4(x
![](https://img.xkw.com/dksih/QBM/2017/6/9/1705263352119296/1706182285500416/STEM/88506f59e19b4b82b6e178726fda9ad4.png?resizew=13)
①⊙O上的点M关于y=x轴对称时,对称点组成的图形是 ;
②求b的取值范围;
(3)⊙E的半径为2,点E(0,t)是y轴上的动点,若⊙E上存在点N,使得点N'是点N关于y=x轴,点(2,0)的“轴中对称点”,并且N'在直线
![](https://img.xkw.com/dksih/QBM/2017/6/9/1705263352119296/1706182285500416/STEM/f5d48dcd8d6a479d8683d7bf9b94021e.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/2017/6/9/1705263352119296/1706182285500416/STEM/a68cf23d8ad94045b71be81fe9797c6b.png?resizew=548)
![](https://img.xkw.com/dksih/QBM/2017/6/9/1705263352119296/1706182285500416/STEM/b731d46fe92b41748b4f4cd563dd471c.png?resizew=248)
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【推荐1】一块直角三角形木板,它的一条直角边
,面积
.甲、乙两人分别按图把它加工成一个正方形桌面,请说明哪个正方形面积大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a2d3b03efafac4c45d63e24897cb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601eb8ba289db872019d71f8c759df0e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f618d7de-5cd4-400f-873b-d559b37b59ed.png?resizew=361)
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【推荐2】在
中,
,将
绕点
旋转一定的角度得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/025d5849-c2d6-40a0-9649-94d72fd46d3c.png?resizew=269)
(1)如图1,当边
恰好经过点C时,边
的延长线交
于点
,连接
.求证:
;
(2)如图2,当点
恰好在
中线
的延长线上,且
时,
的延长线交
于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d2a15061b3f15f299a1c9c1ba66084.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/025d5849-c2d6-40a0-9649-94d72fd46d3c.png?resizew=269)
(1)如图1,当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5f88fb5b872a6ce01db6c0446a8354.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd7c54b13c42d167286aa64d5e28bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
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【推荐3】知识背景:我们在《全等三角形》一章中学习了全等三角形的性质和判定、等腰三角形的性质和判定,在一些探究题中经常用以上知识转化角和边,进而解决问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/089415c9-914c-4ce0-8664-9313caf6c461.png?resizew=459)
(1)问题初探:如图
,
中,
,
,点
是
上一点,连接
,以
为一边作
,使
,
,连接
,猜想
和
有怎样的数量关系,并说明理由.
(2)方法迁移:如图
,
是等边三角形,点
是
上一点,连接
,以
为一边作等边三角形
,连接
,则
、
、
之间有怎样的数量关系?
直接写出答案,不写过程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cc1a387d6ba724f6b9c029807e4bfd.png)
(3)类比再探:如图
,
中,
,
,点
是
上一点,点
是
上一点,连接
,以
一边作
,使
,
,连接
,则
直接写出答案,不写过程,但要求作出辅助线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)拓展创新:如图
,
是等边三角形,点
是
上一点,点
是
上一点,连接
,以
为一边作等边三角形
,连接
,猜想
的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/089415c9-914c-4ce0-8664-9313caf6c461.png?resizew=459)
(1)问题初探:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)方法迁移:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cc1a387d6ba724f6b9c029807e4bfd.png)
(3)类比再探:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf469ccdd5d3ea978357af1d60fe4022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e887de7300ee5cb4d40ddfcac9a686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c68f2bdb229950615f72164dec2a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ca928bf4273b2f7a271d33ceed435b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba4c5a16143a851b899ecb4b180887b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)拓展创新:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df21b7b7a47318ef2bb069450c39f1cd.png)
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