拉杆箱指具有拉杆和滚轮的行李箱,因其使用方便成为出门旅行的必备工具.如图,是一种拉杆式旅行箱的示意图,箱体长AB=50cm,拉杆最大伸长距离BC=30cm,(点A、B、C在同一条直线上),在箱体的底端装有一圆形滚轮⊙A,其直径为10cm,⊙A与水平地面切于点D,过A作
.当人的手自然下垂拉旅行箱时,人感觉较为舒服,已知某人的手自然下垂在点C处且拉杆达到最大伸长距离时,点C距离水平地面
cm,求此时拉杆箱与水平面AE所成角∠CAE的大小及点B到水平地面的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddfbbbc76332758d602086d0d487b0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4c4604e52a4261dadf83013cb8f34a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/c71803dc-870a-4428-9a94-c5efa02a6dcc.png?resizew=425)
更新时间:2017-05-29 09:41:02
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【推荐1】如图,
为
的直径,C是
上一点,过点C作
的切线交
的延长线于点M.作
,垂足为D,交
于点E.
(1)求证:
.
(2)若
,求线段
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b33dddf09abfbd05cd35683b2b70ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/c67e2fb4-cff6-4881-9d7a-9b5129db27ba.jpg?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7897e3f49075943704f4dbef82e5b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0567aae1731bbd6cd5709398ef8910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
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【推荐2】如图所示,
的顶点
、
在⊙
上,顶点
在⊙
外,边
与⊙
相交于点
,
,连接
、
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/75b009ef-d56f-4298-9779-b0d1ef583a58.png?resizew=158)
(1)求证:直线
是⊙
的切线;
(2)若线段
与线段
相交于点
,连接
.
①求证:
;
②若
,求⊙
的半径的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9672cc271c7f79973c34a1e179782762.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/75b009ef-d56f-4298-9779-b0d1ef583a58.png?resizew=158)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae27dafab4a4d80a252e044625dff20d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7cd7836199f3a3fe666ca4a625e48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐1】如图,一个五角星ABCDEFGHIJ,已知A,B,D、E点共线,A,J,H,G四点共线,C,B,J,I四点共线,C,D,F,G四点其线,E,F,H,I四点共线,且
.
.现测得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e3cb0463-95b8-402e-9216-2c66f9faf58d.png?resizew=155)
(1)求BJ的长(精确到0.01)
(2)作直线EG.求点A到EG的距离(精确到0.01)
(参考数值:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a079f41186bb1dd390a6f49784d74cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641b43754c0e53528e8cc330f120431f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123071570a0cf22f09e563aadb6a874b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e3cb0463-95b8-402e-9216-2c66f9faf58d.png?resizew=155)
(1)求BJ的长(精确到0.01)
(2)作直线EG.求点A到EG的距离(精确到0.01)
(参考数值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ca61370b1863688c46a82f6bea210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e2b8c4b295ea220d92e0710f261a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d5300c9635a9b1f30f2fbd5daa540b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e65b532cb0ff99b4b9b1ab026f20e14.png)
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【推荐2】为预防电动自行车引发火灾,保护居民生命财产和公共安全,某小区物业为电动自行车建立了集中停放和充电点,并安装了遮阳棚,方便居民使用(如图1).在如图2所示的侧面示意图中,遮阳棚
长
米,与水平线的夹角为
,立柱
的高为
米,当太阳光线BD与地面CD的夹角为
时,求此时遮阳棚在地面上形成的阴影宽度
的长.(参考数据:
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a510a47251f753b317e1a7495cd68a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7714e5c765b8d9fc86965557aed17ecf.png)
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【推荐3】“轻轨飞梭幻影重,上天入地驶楼中”,
魔幻城市重庆吸引了全国各她的游客,而李子坝的“轻轨穿楼”成了游客们争相打卡的热门景点.如图,已知斜坡
底端
距离轻轨所穿楼栋
底端
处30米远,斜坡
长为42米,坡角为
,
,为了方便游客拍照,现需在距斜坡底端
处12米的
处挖去部分坡体修建一个平行于水平线
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和一条新的坡角为
的斜坡
.
的长;(结果保留根号)
(2)小青在
处测得轻轨所穿楼栋
顶端
的仰角为
,点
在同一个平面内,点
在同一条直线上,且
,求轻轨所穿楼栋
的高度.(结果精确到0.1米,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ecb5aa3a9f18861ccac2ad22987a58.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)小青在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1040eb701f098add9ccbeed17cfb17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cee9eb9a8f6999520fd318a7fc6d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52881be613aa404e553da30d8987cfad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
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