如图,已知AD⊥BC于点D,EF⊥BC于点F,AD平分∠BAC.求证:∠E=∠1.
![](https://img.xkw.com/dksih/QBM/2019/2/17/2142544449609728/2148377839648768/STEM/cbc0c88ba4274f439a893b9156414441.png?resizew=79)
更新时间:2019-02-25 17:48:48
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【知识点】 根据平行线判定与性质求角度解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】阅读下列材料并解答问题:
在一个三角形中,如果一个内角
的度数是另一个内角度数的
倍,那么这样的三角形我们称为
特征三角形
,其中
称为
特征角
例如:一个三角形三个内角的度数分别是
、
、
,这个三角形就是
特征三角形
,其中
特征角
为
.反之,若一个三角形是“特征三角形”,那么这个三角形的三个内角中一定有一个内角
的度数是另一个内角度数的
倍.
,若“特征角”为锐角,则这个“特征角”的度数为
.
(2)如图1,
中,点
在边
上,
平分
交
于点
.
①若
,
,判断
是否为“特征三角形”,并说明理由;
②若
,
是“特征三角形”,请直接写出
的度数;
③如图2,若
为线段
上一点,且
+
,
.若
是“特征三角形”,求
的度数.
在一个三角形中,如果一个内角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fed15b57f7dcae3668a9dbbaca904af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca7514754bba83b1ee7565391a6b3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fed15b57f7dcae3668a9dbbaca904af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca7514754bba83b1ee7565391a6b3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3b753ad06d7e5a41d809c8d32552e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb90b8c8cadeb19eaf4e2abec1ab413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fed15b57f7dcae3668a9dbbaca904af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca7514754bba83b1ee7565391a6b3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fed15b57f7dcae3668a9dbbaca904af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca7514754bba83b1ee7565391a6b3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e3b753ad06d7e5a41d809c8d32552e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84288b493b64c3a30466fb9075621da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.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/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066c7fd724932eef6a43ec951f17981c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648cc68448cb78e36cff296b912ea46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20e5d585fbf903ee5affa6d083ab95f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fe5c73d09889ebd16037f4779a1046.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df46ad76c129a1eccdea3553e0b7423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fe5c73d09889ebd16037f4779a1046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b69923f7d2733e929c02575e7eed623.png)
③如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4974a9f7f0c6dee5ab3cdab6bba5b780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa916895c648a435a323134353fea13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3260ba3881df0ad2fd4b43c440155380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75fb6f9ad72dea327a6895915cd5355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e8f6faf46c448fe8d838fde1af495b.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知
,
.
.
(2)若
,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6f272439f9791d1e535b5ae937a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b063fa9b73d0441015c53b3ae7f0c775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b555191d1fac3347f1f52f23efdc7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aa66e939ee8ab0bc558cdc8f2a5f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
您最近一年使用:0次