如图,在
中,
的垂直平分线交
于点E,交
于点D,若
,则
的度数是______ °.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12c86c04b2af0397d2b246c309e6c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2b365fd3ae84b5355eaa01639e8baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/d939de8c-1414-459b-a36d-42240dd2395a.png?resizew=191)
更新时间:2024-01-19 09:52:16
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【推荐1】如图,在△ABC中,∠BAC=130°,∠C=40°,AD、AE分别是它的高线和角平分线,则∠DAE的度数是_____ °.
![](https://img.xkw.com/dksih/QBM/2021/8/24/2792825214599168/2794574680915968/STEM/f916438c550a4aacb3ae32c53767944a.png?resizew=266)
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【推荐1】如图,已知线段
.①分别以点A,B为圆心,大于
的长为半径画弧,两弧相交于点P,Q;②画直线PQ交AB于点O,以O为圆心,OA为半径画圆;③在
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【推荐2】图1是一款平衡荡板器材,其示意图如图2,
、
为支架顶点,支撑点
,
,
,
在水平地面同一直线上,
、
为荡板上固定的点,
,测量得
,
为
上一点且离地面
,旋转过程中,
始终与
保持平行.如图3,当旋转至
,
,
在同一直线上时,连接
,测得
,
,此时荡板
距离地面
.
的长为 ________
.(2)点
离地面的距离为 _________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44acfe54ec3b275809a9df541f7a1d.png)
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【推荐1】如图,图中提供了一种求
的方法.作
,使
,
,再延长
到点D,使
,连接
,即可得
.如果设
,则
,则
.仿照以上方法,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c0fde2efd770c7e7e6ce04f48d0c76.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08cfc390fa29377c83ca6a03e7b2785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐2】如图,折叠等腰三角形纸片
,使点C落在边
上的点F处,折痕为
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,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/6fab82a4-79b0-46c7-919d-c32499b40e8b.png?resizew=130)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80371754b2bb6259920dd580ba24f37.png)
______ 度;
(2)如果
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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(1)
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(2)如果
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