如图,
是等腰三角形,
,
是
上一点,过点
作
交
于点
,交
的延长线于点
.
(1)求证:
是等腰三角形;
(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/8455657dde27aabe6adb7b188e031c11.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/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/e98db25a-85f0-46f7-bd49-585b2475e618.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2594e927cb7ed022acc039c3bb136d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc848db282db12957acad1e0983d2705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2023-05-17 08:33:28
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
,
于点
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/6/2589114882400256/2610989268377600/STEM/6ced11e3f2ba4bff9e5afee278cdee63.png?resizew=153)
(1)判断
与
的位置关系,并说明理由.
(2)若
,求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947831ad9ba74ab7524ddb9b79db94a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c252a0fe067d434a2b5aeac011b9914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca8e669286b7f6901cb5567283d691e2.png)
![](https://img.xkw.com/dksih/QBM/2020/11/6/2589114882400256/2610989268377600/STEM/6ced11e3f2ba4bff9e5afee278cdee63.png?resizew=153)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8609b833b82c22d7469bd0637481a2cc.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,三角形
中,
,
是
边上的高.
![](https://img.xkw.com/dksih/QBM/2020/5/17/2464687712108544/2464884378689537/STEM/27f1ed40da3047bb81fe0923a2c7819e.png?resizew=148)
(1)写出图中三对互余的角;
(2)你认为
与
相等吗?说明你的理由.(友情提示:三角形内角和180°)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/5/17/2464687712108544/2464884378689537/STEM/27f1ed40da3047bb81fe0923a2c7819e.png?resizew=148)
(1)写出图中三对互余的角;
(2)你认为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】将两个等腰直角三角形如图摆放,
,
,
,点C在边AD上,连结BD,EC.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898566557286400/2917686563110912/STEM/f5635d40-e94f-48b7-b3ab-0bbeaece420d.png?resizew=169)
(1)求证:
.
(2)取BD,EC的中点M,N,判断点A,M,N,为顶点的三角形形状,并说明相应理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898566557286400/2917686563110912/STEM/f5635d40-e94f-48b7-b3ab-0bbeaece420d.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ff95a85058f1803a7630c08c443df.png)
(2)取BD,EC的中点M,N,判断点A,M,N,为顶点的三角形形状,并说明相应理由.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,△ABC中,AD⊥BC,点E在AC的垂直平分线上,且BD=DE.
![](https://img.xkw.com/dksih/QBM/2022/8/15/3044974824136704/3046471298916352/STEM/eeadabd75b7d4f47a6be8587f7162e91.png?resizew=187)
(1)如果∠BAE=40°,那么∠B=______°,∠C=______°;
(2)如果△ABC的周长为23cm,AC=9cm,求△ABE的周长;
(3)你发现线段AB与BD的和等于图中哪条线段的长,并证明.
![](https://img.xkw.com/dksih/QBM/2022/8/15/3044974824136704/3046471298916352/STEM/eeadabd75b7d4f47a6be8587f7162e91.png?resizew=187)
(1)如果∠BAE=40°,那么∠B=______°,∠C=______°;
(2)如果△ABC的周长为23cm,AC=9cm,求△ABE的周长;
(3)你发现线段AB与BD的和等于图中哪条线段的长,并证明.
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解答题-问答题
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适中
(0.65)
【推荐1】小红在学习菱形的概念后,对菱形进一步开展探究活动:如图①,在菱形
中,
,
为对角线.
如图②,点E为
延长线上一点,连接
,在线段
上取点F使
,点G为
与
的交点,则
的度数是 度;
(2)【问题探究】
如图③,点E为
延长线上一点,连接
,在线段
上取点F,使
,判断
的形状,并说明理由;
(3)【拓展延伸】
如图③,在(2)的条件下,探究线段
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
如图②,点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b2656217a9ad3c908a3978b01d0a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
(2)【问题探究】
如图③,点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbc53987576418ad70c12fd6e86f78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
(3)【拓展延伸】
如图③,在(2)的条件下,探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,
为
直径,
为
上的一点,过点
的切线与
的延长线相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/ef4a8a4c-6c24-4812-97d8-2e7c4ede0c01.png?resizew=248)
(1)连接
,求证:
;
(2)
是
中点,连接
,
,若
,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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/9d365cc7ce9022654091eee60bc1c2b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/ef4a8a4c-6c24-4812-97d8-2e7c4ede0c01.png?resizew=248)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51dc424cdea009615f880f54bd2f09f7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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