在等腰三角形
中,已知
,
.
,若
是
的平分线,求证:
;
(2)如图
,若点
,
在
边上,且
,
,分别交
,
于点
,
,连接
,
,猜想
与
的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d55569d5ba8bf91262a1ee7c1d2a52.png)
(2)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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b13d187b25461d85a3b8d10c7b678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b0b831b56c1a03925d0f5a332d8ded.png)
更新时间:2024-01-29 23:32:45
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相似题推荐
解答题-问答题
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【推荐1】如图,在△PAB中,PA=PB,∠APB=100°,点M,N,K分别是PA,PB,AB上的点,若MK=KN,∠MKN=40°,试判断线段AM,BN与AB之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570108863463424/2573145169518592/STEM/dfafaf79323c43a0beac2843daf884ac.png?resizew=175)
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【推荐2】如图,线段
垂直平分线段
,垂足为
,
的延长线交
的延长线于
,
的延长线交
的延长线于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/df3b9b4a-2323-41f6-af1d-95c8bb172878.png?resizew=150)
(1)求证:
;
(2)若
,
,则直接写出图中内角含有
角的等腰三角形(写出4个即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/df3b9b4a-2323-41f6-af1d-95c8bb172878.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f54da98548d933af1af38b62df7e92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
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【推荐1】如图,已知点
是
的平分线上一点,
,
,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/94610d3f-2d8c-41bb-84ef-e2c9a9bbd9bc.png?resizew=159)
(1)
;
(2)
是线段
的垂直平分线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab274af3fbc308c9de2dffb8a30a9bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b23a2060fe9f6f49237a5a7738d2da4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/94610d3f-2d8c-41bb-84ef-e2c9a9bbd9bc.png?resizew=159)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b07cb173465d8575a5104586fd562f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,已知AC平分
,
于E,
于F,且
.
(1)求证:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09df63d4602597d7a48fa92a1a172c18.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c760db19b0826e4542f132adeabae414.png)
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804572672000/2613302124503040/STEM/5d65f154c26d4148968c8495a0b0038f.png?resizew=143)
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【推荐1】如图,在▱ABCD中,∠BAD的平分线AE交DC于点E.
(1)求证:AD=DE;
(2)若AB∶CB=3∶2,CE=5 cm,求▱ABCD的周长.
(1)求证:AD=DE;
(2)若AB∶CB=3∶2,CE=5 cm,求▱ABCD的周长.
![](https://img.xkw.com/dksih/QBM/2019/3/2/2151996084117504/2153461162852352/STEM/f08bf3e531ba47f288be8a6b8802ab5d.png?resizew=122)
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【推荐2】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1中的四边形ABCD是正方形,
ABC是等腰直角三角形,则AC=
AB.
小玲遇到这样一个问题:如图2,在等腰三角形ABC中,AB=AC,∠BAC=45°,BC=2
,AD⊥BC于点D,求AD的长.
小玲发现:如图3,分别以AB,AC为对称轴,分别作出
ABD,
ACD的轴对称图形,点D的对称点分别为E,F,延长EB,FC交于点G,可以得到正方形AEGF,根据轴对称图形的性质和正方形四条边都相等就能求出AD的长,请直接写出:BD的长为 ,BG的长为 ,AD的长为 ;
参考小玲思考问题的方法,解决问题:
如图4,在平面直角坐标系xOy中,点A(3,0),B(0,4),AB=5,点P是
OAB外角的角平分线AP和BP的交点,直接写出点P的坐标为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
小玲遇到这样一个问题:如图2,在等腰三角形ABC中,AB=AC,∠BAC=45°,BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
小玲发现:如图3,分别以AB,AC为对称轴,分别作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
参考小玲思考问题的方法,解决问题:
如图4,在平面直角坐标系xOy中,点A(3,0),B(0,4),AB=5,点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847369672392704/2847788620644352/STEM/9d0f5ac4-91b0-438c-ae58-135b9c39b69c.png?resizew=614)
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解答题-证明题
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【推荐1】如图,
、
是
的两条高,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/31/2891532304834560/2932694008340480/STEM/4110ddac-b1a8-4b75-9120-5c809d129cf8.png?resizew=240)
(1)求证:
.
(2)试说明
与
的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2021/12/31/2891532304834560/2932694008340480/STEM/4110ddac-b1a8-4b75-9120-5c809d129cf8.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd7390343b35d276e90508a6125987d.png)
(2)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】已知抛物线
经过点
和点
,与
轴交于点
,点
为第二象限内抛物线上的动点.
(2)如图1,连接
交
于点
,当
时,请求出点
的坐标;
(3)如图2,点
的坐标为
,点
为
轴负半轴上的一点,
,连接
,若
,请求出点
的坐标;
(4)
是平面内一点,将
绕点
逆时针旋转90°后,得到
,若
的两个顶点恰好落在抛物线上,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c34f23f45d511636fb46dc31913103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.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/3ce31b8db8b642e2a269d7877e79a9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633ca6abf0a23f7986facd5941edfe2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d08edec3caba065419e78e3cf7a38a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedbd3e584fd2080dfe2bd9a8abb755c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e561d2a841309b7b6ad119a3f59580d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e561d2a841309b7b6ad119a3f59580d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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