如图,某建筑物AB在一个坡度为i=1:0.75的山坡BC上,建筑物底部点B到山脚点C的距离BC=20米,在距山脚点C右侧同一水平面上的点D处测得建筑物顶部点A的仰角是42°,在另一坡度为i=1:2.4的山坡DE上的点E处测得建筑物顶部点A的仰角是24°,点E到山脚点D的距离DE=26米,若建筑物AB和山坡BC、DE的剖面在同一平面内,则建筑物AB的高度约为( )(参考数据:sin24°≈0.41,cos24°≈0.91,tan24°≈0.45,sin42°≈0.67.cos42°≈0.74,tan42°≈0.90)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882493238845440/2883664804438016/STEM/735bd10a-6775-4c71-80f8-57fd1690ce37.png?resizew=335)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882493238845440/2883664804438016/STEM/735bd10a-6775-4c71-80f8-57fd1690ce37.png?resizew=335)
A.36.7米 | B.26.3 米 | C.15.4米 | D.25.6 米 |
21-22九年级上·重庆沙坪坝·阶段练习 查看更多[4]
重庆市沙坪坝区南开中学校2021-2022学年九年级上学期12月月考数学试题(已下线)重庆市2021年中考数学真题(A卷)变式汇编2重庆市南开中学校2021-2022学年九年级上学期12月月考数学试题24-解直角三角形的实际应用
更新时间:2021-12-30 14:13:58
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【推荐1】如图,四边形
为菱形,对角线
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交于点
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【推荐2】如图,正方形
边长为20,点P为正方形对角线
上任一点,过点P作
于点E,作
于点F,连接
.给出以下4个结论:①
;②
;③
的最小值是
;④若
时,则
的长度为
.其中正确的个数是( )
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【推荐1】如图,某建筑物
的楼顶上有一避雷针
,在距此建筑物
米的
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米的测倾器
,测得避雷针顶端的仰角为
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米,则避雷针
的长度(结果精确到
米).(参考数据
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【推荐2】如图,某数学活动小组为测量学校旗杆
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【推荐1】如图,某班数学兴趣小组利用数学知识测量建筑物DEFC的高度.他们从点A出发沿着坡度为i=1:2.4的斜坡AB步行26米到达点B处,此时测得建筑物顶端C的仰角α=35°,建筑物底端D的俯角β=30°.若AD为水平的地面,则此建筑物的高度CD约为( )米.(参考数据:
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【推荐2】小明沿着坡度
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【推荐3】四面山是国家5A级风景区,里面有一个景点被誉为亚洲第一岩--土地神岩,土地神岩壁画高度从石岩F处开始一直竖直到山顶E处,为了测量土地神岩上壁画的高度,小明从山脚A处,沿坡度i=1:0.75的斜坡上行65米到达C处,在C处测得山顶E处仰角为26.5°,再往正前方水平走15米到达D处,在D处测得壁画底端F处的俯角为42°,壁画底端F处距离山脚B处的距离是12米,A、B、C、D、E、F在同一平面内,A、B在同一水平线上,EB⊥AB,根据小明的测量数据,则壁画的高度EF为( )米(精确到0.1米,参考数据:sin26.5°≈0.45,cos26.5°≈0.9,tan26.5°≈0.5,sin42°≈0.67,cos42°≈0.74,tan42°≈0.9)
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