如图,身高1.6米的小明从距路灯的底部(点O)20米的点A沿AO方向行走14米到点C处,小明在A处,头顶B在路灯投影下形成的影子在M处.
(1)已知灯杆垂直于路面,试标出路灯P的位置和小明在C处,头顶D在路灯投影下形成的影子N的位置.
(2)若路灯(点P)距地面8米,小明从A到C时,身影的长度是变长了还是变短了?变长或变短了多少米?
(1)已知灯杆垂直于路面,试标出路灯P的位置和小明在C处,头顶D在路灯投影下形成的影子N的位置.
(2)若路灯(点P)距地面8米,小明从A到C时,身影的长度是变长了还是变短了?变长或变短了多少米?
![](https://img.xkw.com/dksih/QBM/2013/7/3/1573667914907648/1573667920658432/STEM/d8211ba4-0793-42a3-8a36-819528437efd.png?resizew=250)
12-13八年级下·江苏扬州·期末 查看更多[10]
2012-2013学年江苏省扬州市江都区八年级下学期期末考试数学试卷浙教版九年级下册数学第3章 3.1投影 第2课时 中心投影随堂练习【区级联考】江苏省泰州市高港区2019届九年级数学期末试题2019年春人教版九年级下学期 第29章《投影与视图》单元测试卷人教新版九年级下学期第29章《投影与视图》单元培优测试卷山东省东营市广饶县2021-2022学年九年级上学期期末数学试题(已下线)第一节 视图与投影03综合测四川省达州市达川区四中联盟2023-2024学年九年级上学期期中数学试题(已下线)第五章 投影与视图 单元达标检测卷-2023-2024学年九年级数学上册《知识解读·题型专练》(北师大版)四川省达州市开江县永兴中学2023-2024学年九年级上学期12月月考数学试题
更新时间:2016-12-05 18:18:29
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【推荐1】真身宝塔,位于陕西省扶风法门镇法门寺内,因塔下藏有佛祖真身舍利而得名.小玲和晓静很想知道真身宝塔的高度
.于是,有一天,他们带着标杆和皮尺来到法门寺进行测量,测量方案如下:如图,首先,小玲在
处放置一平面镜,她从点
沿
后退,当退行1.8米到
处时,恰好在镜子中看到塔顶
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处竖立了一根高1.6米的标杆
,发现地面上的点
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和塔顶
在一条直线上,此时测得
为2.4米,
为11.7米.已知
,
,
,点
、
、
、
、
在一条直线上,请根据以上所测数据,计算真身宝塔的高度
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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【推荐2】如图,已知教学楼前面的玻璃幕墙
垂直于地面,为测量
的高度,身高1.6米的小凯从教学楼底
点沿直线步行4米到达长度为10米的斜坡
的底端
点处,在
处用仪器测得
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上行到达
点(已知
且
),到达
点后继续沿平行于地面的平台直线行走了6米到达
点,此时他刚好踩着太阳光照射下楼顶
点的影子.这时小凯同学的影长
米,用线段
表示小凯同学身高,
,
,
,
,
,
,
,
,
在同一个平面内,且
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,
和
,
,
在各自的同一水平线上,其中
,
,
,
.
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(1)求线段
和
的长度;
(2)求玻璃幕墙
的高度.(
,结果保留一位小数)
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(1)求线段
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(2)求玻璃幕墙
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【推荐1】顾老师布置了周末实践性作业如下,利用影子测量路灯灯泡的高.
身高为
米的小明为了完成老师布置的作业,他设计了如下方案,如图所示,他先从路灯底部(A处)向东走20步到B处,发现自己的影子端点在C处,继续沿刚才自己的影子走5步到C处,此时影子的端点在D处(假设公路是东西方向笔直的公路).根据小明设计的方案,请解决下列问题:
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(1)请在图中画出路灯
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(2)估计路灯灯泡的高度并求影长
.
身高为
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(1)请在图中画出路灯
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(2)估计路灯灯泡的高度并求影长
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【推荐2】(1)如图1所示,快下降到地面的某伞兵在灯光下的影子为AB.试确定灯源P的位置,并画出竖立在地面上木桩的影子EF.(保留作图痕迹,不要求写作法)
(2)画出图2实物的三视图.
(2)画出图2实物的三视图.
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