如图1是由四片大小一样的门扇连接成的折叠门,该门的轨道装在天花板上,图2是其示意图.已知轨道
,在推拉合页
或
时,滚轮
,
在轨道上移动,已知每小片门扇宽度均相等(
).门完全关上时,门扇恰好贴合整条轨道.刚开始门扇叠合在左边,第一次向右拉开门扇,位置如图2时,
,
,此时门被关上部分
的长是__________
;接着继续向右拉门扇,位置如图3时,
,
,相比第一次,门又拉伸了__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b641d415d1ce13cc99342879b6cd0d60.png)
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23-24八年级上·浙江温州·期中 查看更多[2]
浙江省温州市2023-2024学年八年级上学期期中数学试题(已下线)第一章第02讲 等边三角形的性质与判定 (4类热点题型讲练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(北师大版)
更新时间:2023-12-07 15:13:41
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【推荐1】如图,在
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【推荐2】如图,在
中,
分别为
边上的高,
相交于点
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;②
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周长等于
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【推荐1】如图,已知∠AOB=60°,点P在边OA上,点M,N在边OB上,PM=PN,若MN=4,OP+OM=16,则OM=___ .
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【推荐2】如图,
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【推荐2】如图,D为等边三角形
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