如图1是一张双挡位可调节靠背椅,挡位调节示意图如图2,两脚AB,AC以及靠背DE,座位FG,其中D,F分别为AC,DE上固定连接点,GF在点A上移动实现靠背的调节,DC=4AD,EF=4DF,已知AB=AC=DE=50分米,tan∠ABC=2
(1)当GF∥BC时,点E离水平地面BC的高度为___ 分米.
(2)当靠背DE′⊥AC时,有G′E′∥BC,则GF的长为___ 分米.
(1)当GF∥BC时,点E离水平地面BC的高度为
(2)当靠背DE′⊥AC时,有G′E′∥BC,则GF的长为
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932384271933440/2961524495409152/STEM/758d8e00-4c79-46ae-8a83-7172d8d498b1.png?resizew=349)
更新时间:2022-04-19 14:19:55
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