如图是某种云梯车的示意图,云梯
升起时,
与底盘
夹角为
,液压杆
与底盘
夹角为
.已知液压杆
,当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29734c38ed22658147c5418df3c647a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beab437370957321b5ea87c07f0ebf10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649622a8ef7d6746bbee7144c0a49800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/e0155b0e-d6f8-437a-b77d-046bd08d68d9.png?resizew=401)
更新时间:2023-06-06 18:31:19
|
【知识点】 其他问题(解直角三角形的应用)
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【推荐1】某学校体育场看台的侧面如图阴影部分所示,看台有四级高度相等的小台阶,每级小台阶都为0.4米.现要做一个不锈钢的扶手AB及两根与FG垂直且长均为1米的不锈钢架杆AD和BC(杆子的底端分别为D,C),且∠DAB=66°.
![](https://img.xkw.com/dksih/QBM/2015/2/10/1573801403064320/1573801408856064/STEM/6e872964-6891-42e0-9eb5-40fea904f1e9.png?resizew=212)
(1)求点D与点C的高度差DH的长度;
(2)求所用不锈钢材料的总长度l(即AD+AB+BC,结果精确到0.1米).(参考数据:sin66°≈0.91,cos66°≈0.41,tan66°≈2.25,cot66°≈0.45)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1573801403064320/1573801408856064/STEM/6e872964-6891-42e0-9eb5-40fea904f1e9.png?resizew=212)
(1)求点D与点C的高度差DH的长度;
(2)求所用不锈钢材料的总长度l(即AD+AB+BC,结果精确到0.1米).(参考数据:sin66°≈0.91,cos66°≈0.41,tan66°≈2.25,cot66°≈0.45)
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解答题-问答题
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较易
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【推荐2】如图,已知“人字梯”的5个踩档把梯子等分成6份,从上往下的第二个踩档与第三个踩档的正中间处有一条50cm长的绑绳EF,
,求“人字梯”的顶端离地面的高度(AD)和“人字梯”脚长(AC).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0bf40e685b42cc42dd1a2db57a3b14.png)
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874531254059008/2942364836806656/STEM/bb526c4f-e8ce-4539-b8dc-778346de2675.png?resizew=122)
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