1 . 把边长为2的正方形
沿对角线
折起,如图,点
翻折到点
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/6bd0d616-3d1c-4969-80fe-7af7795786ce.png?resizew=180)
(1)当折起的三角形
所在的平面与底面
所成角(即二面角
)为
时,求三棱锥
的体积;
(2)当三角形
翻折到什么位置(即二面角
多大时),三棱锥
的体积最大(不需要证明).并求此时三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/6bd0d616-3d1c-4969-80fe-7af7795786ce.png?resizew=180)
(1)当折起的三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de25bd0a6911c52d0d319c2318a67ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc884f5b4dc9622e90e1303bc481f5.png)
(2)当三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de25bd0a6911c52d0d319c2318a67ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc884f5b4dc9622e90e1303bc481f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecc884f5b4dc9622e90e1303bc481f5.png)
您最近一年使用:0次
解题方法
2 . 仓库的房顶呈正四棱锥形,量得底面的边长为2.6m,侧棱长2.1m,现要在房顶上铺一层油毡纸,那么所需油毡纸的面积是多少?
您最近一年使用:0次
2023-10-09更新
|
127次组卷
|
3卷引用:北师大版(2019)必修第二册课本习题 习题6-6
3 . 如图(1),埃及胡夫金字塔大约建于公元前2580年,其形状为正四棱锥.已知该金字塔高约146.5m,底面边长约232m,求这座金字塔的侧面积和体积(分别精确到
和
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71f8c680db71a63225b2fa75d73c3f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e29c15c78059ea9f68f899eb0ad7b91.png)
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2023-10-05更新
|
253次组卷
|
3卷引用:湘教版(2019)必修第二册课本例题4.5.2 几种简单几何体的体积
湘教版(2019)必修第二册课本例题4.5.2 几种简单几何体的体积8.3.1.2棱柱、棱锥、棱台的体积练习(已下线)专题03 简单几何体的表面积和体积-《知识解读·题型专练》(人教A版2019必修第二册)
名校
解题方法
4 . 已知任意三角形的三边长分别为
,内切圆半径为
,则此三角形的面积可表示为
.其原理是由内切圆的圆心与三角形三个顶点的连线把三角形分割成三个小三角形,每个小三角形的面积等于大三角形的边长与内切球半径的乘积的
,三个小三角形面积相加即得
.请运用类比思想,解决空间四面体中的以下问题.
(1)已知四面体四个面的面积分别为
,
,
,
,内切球的半径为
,请运用类比思想,写出该四面体的中的相应结论;
(2)应用(1)中的结论求解:已知三棱锥(又叫四面体)
,三条侧棱
,
,
两两垂直,且
,求此三棱锥的内切球半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d69e0bbde9001538ffea1063d11db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c011c6b72ee4888607e272e2168178.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/ff37a84b-8751-4101-a6e8-7c7a4b05469a.png?resizew=147)
(1)已知四面体四个面的面积分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)应用(1)中的结论求解:已知三棱锥(又叫四面体)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50094bfee564d9c1b03088ac2ece28c3.png)
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解题方法
5 . 如图,已知三棱锥
的三条侧棱
,
,
两两垂直,且
,
,
,三棱锥
的外接球半径
.
(1)求三棱锥
的侧面积
的最大值;
(2)若在底面
上,有一个小球由顶点
处开始随机沿底边自由滚动,每次滚动一条底边,滚向顶点
的概率为
,滚向顶点
的概率为
;当球在顶点
处时,滚向顶点
的概率为
,滚向顶点
的概率为
;当球在顶点
处时,滚向顶点
的概率为
,滚向顶点
的概率为
.若小球滚动3次,记球滚到顶点
处的次数为
,求数学期望
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00803e67a5d417a9a4dc00277fca778b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495636df02b96acab4478baabe77bafa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69acd73890957b0007b30fd81f2abc0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e159fa38488741d395ea9cb03386b1ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/58b499d6-5736-43f6-94b9-dd6be5e9ef67.png?resizew=139)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)若在底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.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/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
您最近一年使用:0次
解题方法
6 . 如图一,将边长为2的正方形
剪去四个全等的等腰三角形后,折成如图二所示的正四棱锥.记该正四棱锥的斜高为
(侧面三角形的高),
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/821276de-d4d7-4f18-a24e-658a6bde1412.png?resizew=244)
(1)求证:
;
(2)将折起来后所得正四棱锥的表面积记为
,请将
表示为
的函数,并求
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535020bea3472a6ef9f0256bd37ccbc3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/821276de-d4d7-4f18-a24e-658a6bde1412.png?resizew=244)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04e8a297b28f18d198206a60501996a.png)
(2)将折起来后所得正四棱锥的表面积记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
您最近一年使用:0次
名校
解题方法
7 . 如图所示,施工队欲用钢板搭建一个总高为12米的仓库,仓库由上部屋顶和下部主体两部分组成,屋顶的形状呈正四棱锥
,可用四块完全一样的三角形钢板拼接而成:主体的形状呈正四棱柱
,可用四块完全一样的长方形钢板拼接而成.已知屋顶的造价与屋顶的面积成正比,比例系数为k,主体的造价与主体的高度成正比,比例系数为4k,其中k为大于零的常数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/84670cd3-793e-4044-b40f-5b1f38a64bb0.png?resizew=138)
(1)设
,
,求屋顶的面积S(用a,b表示);
(2)若施工队采用的三角形钢板的形状为等边三角形,长方形钢板的形状为正方形,求屋顶与主体的造价的比值(精确到1);
(3)若主体的底面是边长为6的正方形,施工队应选择何种尺寸的钢板,才能使得搭建合库的工程最经济实惠?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/84670cd3-793e-4044-b40f-5b1f38a64bb0.png?resizew=138)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666dc2a5188fa45948bb6e772685ac1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aada537209e8ab7626e42b17f68907b1.png)
(2)若施工队采用的三角形钢板的形状为等边三角形,长方形钢板的形状为正方形,求屋顶与主体的造价的比值(精确到1);
(3)若主体的底面是边长为6的正方形,施工队应选择何种尺寸的钢板,才能使得搭建合库的工程最经济实惠?
您最近一年使用:0次
8 . 设正六棱锥
的底面积为
,高为h,侧面积为S,
(1)将S表示为h的函数;
(2)当
时,求
的正弦值;
(3)将F到平面
的距离d表示为h的函数,并求d的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b7838a53d0b3ed4565fb6a890f365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)将S表示为h的函数;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1447d5ea9ed1b6ccb5a3e5aa967595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)将F到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
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解题方法
9 . 如图,平面
内有半径为a的圆O,过直径
的端点A作
,
,C是圆O上一点,
,求三棱锥
的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e35f3a470885d88519e1a71db4b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00803e67a5d417a9a4dc00277fca778b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c646c683fbe522edb7ea54fd3ad873d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cce6a97ac97fd526e70921b4873ca9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/0c1a9b3e-07da-4ef1-bfa9-2c99a19af8b7.png?resizew=158)
您最近一年使用:0次
名校
解题方法
10 . 正四棱锥
的展开图如图所示,侧棱
长为1,记
,其表面积记为
,体积记为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/e2bf084b-f7e5-47d8-add0-6ed4bfada543.png?resizew=202)
(1)求
的解析式,并直接写出
的取值范围;
(2)求
,并将其化简为
的形式,其中
为常数;
(3)试判断
是否存在最大值,最小值?(写出结论即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c55c1c441f921d874702a4f19ed17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794f2c6bd63355105d179d11306a9cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9d76fb48eb30e7946cb96047e08206.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/e2bf084b-f7e5-47d8-add0-6ed4bfada543.png?resizew=202)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794f2c6bd63355105d179d11306a9cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d0adafeb8e5d088e974f1246880055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a296bb758c36b50b102a4ceb2dea42bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
(3)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d0adafeb8e5d088e974f1246880055.png)
您最近一年使用:0次
2022-07-05更新
|
813次组卷
|
7卷引用:北京一零一中学2021-2022 学年高一下学期期末考试数学模拟试题(一)
北京一零一中学2021-2022 学年高一下学期期末考试数学模拟试题(一)上海市洋泾中学2022-2023学年高二上学期期中数学试题湖北省郧阳中学、恩施高中、沙市中学、随州二中、襄阳三中2022-2023学年高二上学期10月联考数学试题湖北省五校(郧阳中学、恩施高中、沙市中学、随州二中、襄阳三中)2022-2023学年高二上学期10月月考数学试题湖北省黄石市第二中学2023-2024学年高二上学期9月月考数学试题(已下线)湖南省长沙市雅礼中学2024届高三上学期月考(二)数学试题变式题19-22(已下线)期中测试卷01(测试范围:第10-11章)-2023-2024学年高二数学单元速记·巧练(沪教版2020必修第三册)