在学习实数时,我们知道了正方形对角线的长度是边长的
倍,所以等腰直角三角形的底边长是腰长的
倍
例如,图
中的四边形
是正方形,
是等腰直角三角形,则
.
小明遇到这样一个问题:如图
,在等腰三角形
中,
于点
,求
的长.
小明发现:如图
,分别以
为对称轴,分别作出
的轴对称图形,点
的对称点分别为
,延长
交于点
,可以得到正方形
,根据轴对称图形的性质和正方形四条边都相等就能求出
的长,请直接写出:
的长为___________ ,
的长为___________ ,
的长为___________ ;
参考小明思考问题的思路和方法,解决问题:
如图
,在平面直角坐标系
中,点
,点
是
两外角的角平分线
和
的交点,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882a6e8f86e28c2382ab50e2c8ab0c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dca91cd734f440565f9c4e7ec61592.png)
小明遇到这样一个问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fd028aac17dbb1ad8cd2bfe0dff66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
小明发现:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6446c8a33f62ca7c5f8cd2e6f271722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ef41b6a85641b160287852a362723c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a460f95e8ebabac97d572fecea8fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb95d5210330c504c659d866e00d49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a528a9e05c1097f568566ceac619ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
参考小明思考问题的思路和方法,解决问题:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff36cda73d535be9936e3874e9a6bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ed6bee57f4526320197d6a7474386f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/200ef72c-c144-48bd-8753-16745c4377ce.jpg?resizew=415)
更新时间:2023-10-07 10:27:41
|
相似题推荐
解答题-证明题
|
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名校
【推荐1】如图,AD与BC相交于点F,FA=FC,∠A=∠C,点E在BD的垂直平分线上.
(1)如图1,求证:∠FBE=∠FDE;
(2)如图2,连接CE分别交BD、AD于点H、G,当∠FBD=∠DBE=∠ABF,CD=DE时,直接写出所有与△ABF全等的三角形.
(1)如图1,求证:∠FBE=∠FDE;
(2)如图2,连接CE分别交BD、AD于点H、G,当∠FBD=∠DBE=∠ABF,CD=DE时,直接写出所有与△ABF全等的三角形.
![](https://img.xkw.com/dksih/QBM/2018/4/3/1916155567259648/1920231367925760/STEM/2f4b92e1-902e-48f9-8f7c-b31a65ca1902.png)
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【推荐2】在
中,
,
,点
为直线
上一动点
点
不与
、
重合
,以
为边在
的右侧作正方形
,连接
.
在线段
上时,
①
与
的位置关系是:___________;
②
、
、
之间的数量关系为:___________(将结论直接写在横线上)
(2)数学思考:如图
,当点
在线段
的延长线上时,上述①、②中的结论是否仍然成立?若成立,请给予证明,若不成立,请你写出正确结论再给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300aefd67369742e2b1ddcdc02dd495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b78d48bd70b977715edc09b1ca98a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
(2)数学思考:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
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【推荐1】发现问题:如图1所示,已知直角梯形
中,A是
上一点,
,
,
,且
,
,试说明直角三角形
的三边a、b、c之间的数量关系:
初步探究:(1)试说明:
;
问题解决:(2)请用两种含有a,b,c的代数式的方法表示直角梯形
的面积:
______.
______.
由此,你能得到的a、b、c的数量关系是:____________.
【拓展应用】(3)如图2,等腰三角形
中,D是底边
上的中点,
,
,E、F分别是线段
和
上的两个动点,求:
的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1f41676b-8e07-44a0-8ac5-fb499ddf1aeb.png?resizew=355)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342225efea9ad237471c2d13ae5e2d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
初步探究:(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fb695cf150fc359ef68a454f27da91.png)
问题解决:(2)请用两种含有a,b,c的代数式的方法表示直角梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a71fd7e6a7d9adaabb5b66fbc8fa69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a71fd7e6a7d9adaabb5b66fbc8fa69.png)
由此,你能得到的a、b、c的数量关系是:____________.
【拓展应用】(3)如图2,等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393aecc2fca4218b20b5ca786d272310.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1f41676b-8e07-44a0-8ac5-fb499ddf1aeb.png?resizew=355)
图1 图2
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【推荐2】如图,
为圆
的内接三角形,
,连接
并延长交
于点
.
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/e51225c2-a089-45ff-b130-15ab8fb6ea91.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5644573f740b68ea941bd49eb3253a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,面积为4的正方形ABCO的顶点C、A分别在x轴、y轴上,函数y=
(x>0)的图象通过点B.把正方形ABCO沿BC翻折得到正方形BCFD,DF交函数y=
(x>0)的图象于点E.
(1)求k的值.
(2)求点E的坐标.
(3)点E是DF的中点吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
(1)求k的值.
(2)求点E的坐标.
(3)点E是DF的中点吗?说明理由.
![](https://img.xkw.com/dksih/QBM/2021/8/14/2785747384803328/2785982600617984/STEM/f1f4f57a76b04e9e8c95da9c2bf67838.png?resizew=188)
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【推荐2】如图,正方形ABCD中,E为CD上一点,且DE=
CD,连接AE并延长交∠DCM的平分线于点F,连接BD交AF于点G.
(1)写出图中的相似三角形(不包括相似比是1三角形).
(2)求AG:GE:EF.
(3)设DE=
CD(k≠1的正整数),试直接写出AG:GE:EF的比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(1)写出图中的相似三角形(不包括相似比是1三角形).
(2)求AG:GE:EF.
(3)设DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633d22853c65a3b97f7eb74afa8da9b1.png)
![](https://img.xkw.com/dksih/QBM/2018/11/22/2080934061563904/2080963714129920/STEM/d66d4aec00fe4c3491d80dbd5d55156e.png?resizew=224)
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【推荐1】如图,在△ABC中,AB=AC,AD是BC边上的中线,点E是AD边上一点,过点B作BF∥EC,交AD的延长线于点F,连接BE,CF.
(2)若DE=
BC,求证:四边形BECF是正方形.
(2)若DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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【推荐2】如图,四边形
的对角线
、
相交于点O,且
,
,
.四边形
是正方形吗?请说明理由.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdad2e298d52079589e6de6d69d042e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70834818750d0454474ac7c357cd287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/1b50d392-d006-4737-bd63-b86a37ba057d.png?resizew=104)
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