兴隆塔,建于隋朝,位于区博物馆内.某校开展数学建模活动,有建模课题组的学生选择测量兴隆塔的高度,为此,他们设计了测量方案.如图,兴隆塔垂直于水平面,他们选择了与兴隆塔底部
在同一水平面上的
两点,测得
米,在
两点观察塔顶
点,仰角分别为
和
,其中
,
,
的长;
(2)在(1)的条件下求多面体
的表面积;
(3)在(1)的条件下求多面体
的内切球的半径;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137335385add246ec8aed081da03679c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f7daaafe649f5fad149391b5992f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0c6766bd801fa114221d0ab0bfa61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)的条件下求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
(3)在(1)的条件下求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
更新时间:2024-06-17 16:40:29
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,马鞍山长江公铁大桥是巢马城际铁路控制性工程,总长3248米,为世界上首座双主跨超千米的三塔斜拉桥,同时也是世界上最长联钢桁梁斜拉桥.为了解桥的一些结构情况,某学校道路桥梁工程设计学习小组将大桥的结构进行了简化,取其部分抽象成图中所示的模型,其中
为其中两座桥塔的高,通过测量得知
米,
米,点
在线段
上,且在点
处测得
的顶端
的仰角为
,在点
处测得
的顶端
的仰角为
.当
时,
.
(1)求主塔的高
的长度.
(2)是否存在点
,使得
?如果存在,求出点
的位置;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12b400dfa686367508995374a00a3a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d5678c9fae17f185fc425443fb59cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9330f5a1902fe99fc5edd744fbe9146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f4a36e9089b508ee66776f23122519.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/70021eaf-7a9a-4c04-b8c0-8c461a0077fc.jpg?resizew=235)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/0c990f17-b0c6-495b-9629-fb1b4edde6e5.png?resizew=111)
(1)求主塔的高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9be28e95e537abffbfc03fdfe645cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】某人在山顶观察地面上相距2500m的A、B两个目标,测得A在南偏西
,俯角为
,同时测得B在南偏东
,俯角是
,求山高(设A、B与山底在同一平面上,计算结果精确到0.1m).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751f331680f5c8626631b401cf52b5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9669808955c02cfe76827b22fe58dd54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在正方体
中,
分别为棱
的中点,现在顶点
处截去三棱锥
,仿此同样方式,在顶点
处各截去三棱锥,设剩下的几何体为
,
(1)几何体
是几面体?共有多少条棱?(直接写出结论,不需要说明理由)
(2)若正方体的棱长为
,求几何体
的表面积;
(3)若
分别为
的中点,求平面
与面
所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b094411c562930ff2d67b582cfd48cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68965a6791bdeeff6e906ce7b3d2e3b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e7db19157a90647f1f1e9bc7b9a7ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2e7a61c834e6cd5c8ff37862d3921f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
(1)几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
(2)若正方体的棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe1aed936e231d7824c6ac1feeb0326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2070d3881b08d3e4405a0981d44854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4cba9d2412e4a28f8740bddd5738d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ca8f9bf2190154e4695aa666f57be.png)
您最近一年使用:0次
【推荐2】如图,一个圆锥挖掉一个内接正三棱柱
(棱柱各顶点均在圆锥侧面或底面上),若棱柱侧面
落在圆锥底面上.已知正三棱柱底面边长为
,高为2.
的体积;
(2)求该几何体的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
(2)求该几何体的表面积.
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
解题方法
【推荐3】一几何体按比例绘制的三视图如图所示(单位:
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c0bd6ffe-0378-47cf-8be4-a9b463270abc.png?resizew=196)
(1)试画出它的直观图(不写作图过程);
(2)求它的表面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c0bd6ffe-0378-47cf-8be4-a9b463270abc.png?resizew=196)
(1)试画出它的直观图(不写作图过程);
(2)求它的表面积和体积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图所示,点
是边长为2的正方形
所在平面外一点,且
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/9/1/2798708951703552/2799451002060800/STEM/ee7447b5-f79e-406d-8f31-82e98f833b77.png?resizew=228)
(1)求证:
;
(2)若二面角
与
的大小均为45°,求过
,
,
,
,
五点的球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a09d03d26008b17d89e98125eff110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d19526cadbce0e984c2edc3f31d591.png)
![](https://img.xkw.com/dksih/QBM/2021/9/1/2798708951703552/2799451002060800/STEM/ee7447b5-f79e-406d-8f31-82e98f833b77.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c911b404bbb8f8d5f1470585fa31ad97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知,在三棱锥
中,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad8c4151089079a3d729a74ca22e5e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/22ef5f04-b5bb-416f-b692-c2d6c1f5d354.png?resizew=175)
(1)求证:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb9be0889b7ef7bee60b26eece6845b.png)
(2)若
是三棱锥
外接球上任一点,求三棱锥
体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6d682b584f0698a9a5c7a07d3102ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad8c4151089079a3d729a74ca22e5e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/22ef5f04-b5bb-416f-b692-c2d6c1f5d354.png?resizew=175)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb9be0889b7ef7bee60b26eece6845b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
您最近一年使用:0次