如图,已知菱形ABCD的顶点A(
,0),∠DAB=60°,若动点P从点A出发,沿A→B→C→D→A→B→…的路径,在菱形的边上以每秒0.5个单位长度的速度移动,则第2020秒时,点P的坐标为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/b449a6a9-24c2-455a-b07d-ad8bdf8acbb4.png?resizew=185)
2020·辽宁沈阳·一模 查看更多[3]
2020年辽宁省沈阳市皇姑区九年级中考一模数学试题(已下线)专题18.26 菱形-动点问题(专项练习)-2020-2021学年八年级数学下册基础知识专项讲练(人教版)湖南省澧县张公庙中学2021-2022学年八年级下学期数学期末复习试卷(一)
更新时间:2020-05-12 23:35:52
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【推荐1】如图,在平行四边形
中,
,
,点P在边
上以每秒
的速度从点A向点D运动,点Q在边
上以每秒
的速度从点C向点B运动.两个点同时出发,当点Q到达点B时停止运动(同时点P也停止运动).当运动时间为___________ 秒时,线段
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
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【推荐2】如图,在四边形
中,
,且
,
动点P,Q分别从点D,B同时出发,点P以
的速度向终点A运动,点Q以
的速度向终点C运动.______ 秒时四边形
是平行四边形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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【推荐1】如图,
是
的外接圆,
是
的直径,若
的半径为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
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【推荐2】新冠疫情期间,同学们都在家里认真的进行了网课学习,小明利用平板电脑学习,如图是他观看网课时的侧面示意图,已知平板宽度即
,平板的支撑角
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处观看(即
),点E是小明眼睛的位置,
垂足为
.
是小明观看平板的视线,
为
的中点,根据研究发现,当视线与屏幕所成锐角为
时(即
),对眼睛最好,那么请你求出当小明以此视角观看平板时,他的眼睛与桌面的距离
的长为________
.(结果精确到
)(参考数据:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9040c9795e7132ebf65ede1f98c4d72b.png)
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