如图,在
中,
,以点
为圆心,
长为半径作弧交
于点
,交
于点
.再分别以点
,
为圆心,大于
长为半径作弧,两弧相交于
,
两点,作直线
.若直线
经过点
,则
的度数为________ °.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b840be5852709e18ea985954545e78d.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/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
更新时间:2023-11-02 11:55:18
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【推荐1】如图,在
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【推荐2】如图是按以下步骤作图:(1)在△ABC中,分别以点B,C为圆心,大于
BC长为半径作弧,两弧相交于点M,N;(2)作直线MN交AB于点D;(3)连接CD,若∠BCA=90°,AB=6,则CD的长为_____ .
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【推荐1】阅读下面材料:
在数学课上,老师提出如下问题:
![](https://img.xkw.com/dksih/QBM/2017/7/16/1731333550047232/1733038013997056/STEM/6a953c59080447289c01849f0b51b46b.png?resizew=350)
小颖的作法如下:
![](https://img.xkw.com/dksih/QBM/2017/7/16/1731333550047232/1733038013997056/STEM/6bf82de58fbd40d9b51385acfcba7309.png?resizew=597)
老师说:“小颖的作法正确.”
请回答:小颖的作图依据是___________________________________________ .
在数学课上,老师提出如下问题:
![](https://img.xkw.com/dksih/QBM/2017/7/16/1731333550047232/1733038013997056/STEM/6a953c59080447289c01849f0b51b46b.png?resizew=350)
小颖的作法如下:
![](https://img.xkw.com/dksih/QBM/2017/7/16/1731333550047232/1733038013997056/STEM/6bf82de58fbd40d9b51385acfcba7309.png?resizew=597)
老师说:“小颖的作法正确.”
请回答:小颖的作图依据是
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【推荐2】如图,在菱形
中,
,在
上取一点E,以点E为圆心,任意长为半径作弧,交AD于M,N两点,分别以点M,N为圆心,大于
长为半径向
同侧作弧,交于点P,作射线
,点B在
上,连接
,若
,则菱形
的面积为______ .
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【推荐1】如图,在△ABC中,∠C=40°,过顶点B的一条直线把△ABC分割成两个等腰三角形,且∠C是其中一个等腰三角形的顶角.则∠ABC=_________ .
![](https://img.xkw.com/dksih/QBM/2019/10/12/2310468668612608/2317012454899713/STEM/cd7e5840225c49359c6643d416894f90.png?resizew=150)
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【推荐2】如图,点D在BC上,AB=AC=BD,AD=DC,则∠BAC的度数是_____ .
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