如图,小亮同学用自制的直角三角形纸板
测量树的高度
,他调整自己的位置,设法使斜边
保持水平,并且边
与树顶B在同一直线上.已知纸板的两条边
,延长
交
于点C,测得边
离地面的高度
,
,求树高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f54f9cfcaa672a1b8410c81609f867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5d5302094ba422c91bc97bf81d2660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a88aefea5d81c3b202df352b0b677d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/546a5041-9d46-499a-b0d5-64d2ae32b912.png?resizew=253)
更新时间:2024-03-08 16:39:28
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【推荐1】如图,在△ABC中,∠ACB=90°,AB=5,AC=4,过点C作直线MC使得∠BCM=∠BAC,求点B到直线MC的距离.
![](https://img.xkw.com/dksih/QBM/2016/6/14/1574211231358976/1574211236896768/STEM/2f1f0a280ac346bba985a7a7ead43a5d.png)
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【推荐2】如图,已知四边形ABCD是菱形,对角线AC、BD相交于点O,BD = 2AC.过点A作AE⊥CD,垂足为点E,AE与BD相交于点F.过点C作CG⊥AC,与AE的延长线相交于点G.
(1)求证:△ACG≌△DOA;
(2)求证:
.
(1)求证:△ACG≌△DOA;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f495874d0b64f3cfe73b262d650b4084.png)
![](https://img.xkw.com/dksih/QBM/2019/4/19/2185984827834368/2190621145907200/STEM/55c06217c0254fa8b466e61ae5ba1e3d.png?resizew=240)
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【推荐3】如图①,已知△ABC内接于⊙O,∠BOC=120°,点A在优弧BC上运动,点M是
的中点,BM交AC于点D,点N是
的中点,CN交AB于点E,BD、CE相交于点F.
(1)求证:当∠ACB=60°时,如图②,点F与点O重合;
(2)求证:EF=DF;
(3)在(1)中,若△ABC的边长为2,将△ABD绕点D,按逆时针方向旋转m°,得到△HGD(DH<DG),AB与DH交于点J,DG与CN交于点I,当0<m<60时,△DLJ的面积S是否改变?如果不变,求S的值;如果改变,求S的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
(1)求证:当∠ACB=60°时,如图②,点F与点O重合;
(2)求证:EF=DF;
(3)在(1)中,若△ABC的边长为2,将△ABD绕点D,按逆时针方向旋转m°,得到△HGD(DH<DG),AB与DH交于点J,DG与CN交于点I,当0<m<60时,△DLJ的面积S是否改变?如果不变,求S的值;如果改变,求S的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/5/25/2211436223143936/2212452017799168/STEM/1181761f868f479ebd5344f6acee222c.png?resizew=420)
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名校
【推荐1】测量物体高度
小明想测量一棵树的高度
,在阳光下,小明测得一根长为
米的竹竿的影长为
米.同时另一名同学测量一棵树的高度时,发现树的影子不全落在地面上,有一部分影子落在教学楼的墙壁上(如图),其影长为
米,落在地面上的影长为
米,则树高
为多少米.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/b018c3d1-5310-40a5-9843-8871f7b95aa7.png?resizew=188)
小明在某一时刻测得
的杆子在阳光下的影子长为
,他想测量电线杆
的高度,但其影子恰好落在土坡的坡面
和地面
上,量得
,
,
与地面成
.求电线杆的高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05c50ea5f6068e3ebc11ec59723d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5db9fa0bc36e2308bd3eecd5e78351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7c304b64435d1697c1ea29efe08fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a637e8f4e368c079616955509b1717e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/b018c3d1-5310-40a5-9843-8871f7b95aa7.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f26c2ded122a46dd44b8d8b2740a4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef959a420dc4a40d40e1960a68d1acce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44123406c6afba90fd7d944eec5e849e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cebf2ddc787dd8ecabffb55e8250558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
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【推荐2】“度高者重表,测深者累矩,孤离者三望,离而又旁求者四望.触类而长之,则虽幽遐诡伏,靡所不入.”就是说,使用多次测量传递的方法,就可以测量出各点之间的距离和高度差.——刘徽《九章算术注·序》.某市科研考察队为了求出某海岛上的山峰
的高度,如图,在同一海平面的
处和
处分别树立标杆
和
,标杆的高都是5.5米,
两处相隔80米,从标杆
向后退11米的
处,可以看到顶峰
和标杆顶端
在一条直线上;从标杆
向后退13米的
处,可以看到顶峰
和标杆顶端
在一条直线上.求山峰
的高度及它和标杆
的水平距离.
注:图中各点都在一个平面内.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
注:图中各点都在一个平面内.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/92d28614-5443-437a-a842-91685489b942.png?resizew=215)
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