如图,在
中,由尺规作图的痕迹,判断下列结论中不一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
A.![]() | B.![]() | C.![]() | D.![]() |
21-22八年级下·吉林白城·期末 查看更多[6]
吉林省白城市大安市2021-2022学年八年级下学期期末数学试题(已下线)专题9.36 平行四边形折叠问题(巩固篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)江苏省无锡市江阴市青阳片2022-2023学年八年级下学期期中数学试题广东省汕头市潮阳区2022-2023学年八年级下学期期末数学试题江苏省苏州市吴江区梅震平教育集团2022-2023学年八年级下学期课堂练习数学试卷广东省江门市鹤山市昆仑学校2023-2024学年八年级下学期月考数学试题
更新时间:2022-08-28 18:05:35
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【推荐1】如图,在
中,
,
和
的平分线交于点
,得
;
和
的平分线交于点
得
;
和
的平分线交于点
,……则
等于( )度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/6e40a0fc-9901-4844-8467-5908d8a24ec3.png?resizew=181)
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【推荐1】已知,如图,A(0,5),AC=13,以点A为圆心,适当长为半径画弧,分别交AO、AC于点D,E,再分别以点D、E为圆心,大于
DE的长为半径画弧,两弧交于点F,作射线AF交x轴于点G,则点G的横坐标是( )
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586307762651136/2590542480211968/STEM/5fbb38d9ab25470f8838555f3cd7274e.png?resizew=165)
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【推荐2】如图,在
中,
,
,某同学通过尺规作图得到射线
,交
于点D,根据其作图痕迹,可得
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】如图,△ABC中,BD平分∠ABC,AD垂直于BD,△BCD的面积为45,△ADC的面积为20,则△ABD的面积为( ).
![](https://img.xkw.com/dksih/QBM/2019/11/8/2334312166522880/2347240356585472/STEM/eacc9861312a4801931d4501605b3385.png?resizew=256)
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A.20 | B.18 | C.16 | D.25 |
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【推荐2】已知
中,
与
的平分线的交点
恰好在
边的高
上,那么
一定是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐1】如图,
是
的中线,增加下列条件,能判断
是菱形的是( )
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【推荐2】如图,在平行四边形
中,
为
上一点,连接
、
,且
、
交于点
,
:
:
,则
:
( )
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