如图所示,小亮在大楼
的观光电梯中的
点测得大楼
楼底
点的俯角为60°,此时他距地面的高度
为21米,电梯再上升9米到达
点,此时测得大楼
楼顶
点的仰角为45°,求大楼
的高度.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2620302882103296/2625362970198016/STEM/badfad1f-7921-46aa-832e-210363cd2662.png)
20-21九年级上·辽宁沈阳·期末 查看更多[9]
辽宁省沈阳市沈河区2020-2021学年九年级上学期期末数学试题山东省东营市河口区(五四制)2020-2021学年九年级上学期期末数学试题安徽省阜阳市2020-2021学年九年级上学期期末数学试题2021年天津市河西区中考数学模拟试题2021年安徽省宣城市三校联考中考数学模拟试卷(3月份)山东省济南市莱芜区实验中学片区教研共同体(五四制)2020-2022学年九年级上学期期中考试数学试题山东省济南市钢城区里辛初级中学(五四制)2021-2022学年九年级上学期期中考试数学试题山东省东营市河口区实验学校2022-2023学年九年级上学期期中数学试题湖南省湘潭市湘潭县湘潭江声实验学校2023-2024学年九年级上学期月考数学试题
更新时间:2020-12-30 15:37:32
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【推荐1】如图,线段
垂直于x轴的负半轴,垂足分别为
,
,
,E是
的中点,反比例函数
的图象经过点E,与
交于点F.
(1)若点B坐标为
,求m的值;
(2)若
,且点E的横坐标为a,求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fa8bd3792adb4f75697357808cd50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcb0e5388b1dd6d371577adc5c937c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7924250556e9da769f6c9a7f3abfa8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/9/bb3c2b9c-a2f5-40da-84e6-15aa701be310.png?resizew=142)
(1)若点B坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00e1beb309e45e52341ce67bc18ce94.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319cd013e2b0be94b9bd2286f7bb641c.png)
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【推荐2】已知,如图,在
中,对角线
与
相交于点O,过点C作
的平行线,过点D作
的平行线,两线相交于点P.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727957406384128/2727981840531456/STEM/a23db806-4bd9-4b95-92a1-73974f1b1a6e.png)
(1)当四边形
是矩形时,证明四边形
是菱形;
(2)当四边形
是菱形时,且
.求点O到点P的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727957406384128/2727981840531456/STEM/a23db806-4bd9-4b95-92a1-73974f1b1a6e.png)
(1)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39a4d3936f26f94f4e85a1be4eefd66.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd3e908df5825bc6c17e629247a8243.png)
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【推荐1】如图,在我市的上空一架飞机由A向B沿水平直线方向飞行,沿航线AB的正下方有两个景点水城明珠大剧院(记为点C),光岳楼(记为点D),飞机在A处时,测得景点C、D在飞机的前方,俯角分别为60°和30°.飞机飞行了3千米到B处时,往后测得景点C的俯角为30°.而景点D恰好在飞机的正下方,求水城明珠大剧院与光岳楼之间的距离(最后结果精确到0.1千米)
![](https://img.xkw.com/dksih/QBM/2016/7/21/1574221073571840/1574221079379968/STEM/4a1f8c9f61ff4c61bb87f00ea4284867.png)
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【推荐2】某数学小组为了测量万楼主楼高度,进行了如下操作:如图,用一架无人机在楼基
处起飞,沿直线飞行120米至点
,在此处测得楼基
的俯角为60°,再将无人机沿水平方向向右飞行30米至点
,在此处测得楼顶
的俯角为30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/a1d9b454-cabf-4c1b-9832-750db4f02d0e.png?resizew=325)
(1)填空:
______度,
______度
(2)求万楼主楼
的高度.(结果保留整数,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/a1d9b454-cabf-4c1b-9832-750db4f02d0e.png?resizew=325)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341c1424c92b7692c60a769250f24e36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8418bdd158ba514f21b9c8d1c70afd07.png)
(2)求万楼主楼
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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