如图所示,在边长为4的正三角形ABC中,E,F分别是边AB,AC上的中点,
,
,
,垂足分别是D,H,G,将△ABC绕AD旋转一周,求阴影部分形成的几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179f83b6490ae006ae5a536bd8b63db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://img.xkw.com/dksih/QBM/2017/11/30/1828554531414016/1831068540166144/STEM/eb703fbb4c2b472a99775d8f688319a3.png?resizew=152)
更新时间:2017-12-04 10:21:23
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在平行六面体
中,
,
,
平面
,
与底面
所成角为
,
.
![](https://img.xkw.com/dksih/QBM/2020/2/2/2390522890493952/2391722308886528/STEM/c5c6cd2d4e9443a0abc1e029e5ffc3f5.png?resizew=236)
(1)求证:平行六面体
的体积
,并求
的取值范围;
(2)若
,求二面角
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4890e58791814622b87c4d60ea971f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/801f6cdac1f3b01b3ee3cd4cb7d7a798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753918a2f9bf67323985123eeb27a262.png)
![](https://img.xkw.com/dksih/QBM/2020/2/2/2390522890493952/2391722308886528/STEM/c5c6cd2d4e9443a0abc1e029e5ffc3f5.png?resizew=236)
(1)求证:平行六面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8db0de179cadd656e88859c38b82e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905dd10639c9fef5ef8d66a124756140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba64da1e7ee85a5b4fd0e6ca5219f6b.png)
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【推荐2】如图,在三棱柱
中,平面
平面
,四边形
是正方形,四边形
是矩形,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/2/8/2912088042602496/2915613525827584/STEM/48ae55a3-e71c-4798-bdaa-7d126d03ca14.png?resizew=150)
(1)证明:
平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/2022/2/8/2912088042602496/2915613525827584/STEM/48ae55a3-e71c-4798-bdaa-7d126d03ca14.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aea24647cd4d0b4b9aa513bf5457b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95196d4658088f565e495c005cfed5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,矩形ABCD中,BC=2,AB=1,PA⊥平面ABCD,BE∥PA,BE=
PA,F为PA的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/57a1f467-bdd9-4835-baf7-01dee2d87eed.png?resizew=180)
(1)求证:DF∥平面PEC;
(2)记四棱锥C-PABE的体积为V1,三棱锥P-ACD的体积为V2,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/57a1f467-bdd9-4835-baf7-01dee2d87eed.png?resizew=180)
(1)求证:DF∥平面PEC;
(2)记四棱锥C-PABE的体积为V1,三棱锥P-ACD的体积为V2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在四棱锥
中,
,
,
,
,
平面
,点
是棱
上一点,且
平面
,三棱锥
的体积为
.
到平面
的距离;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931f54178ee3eba80efdf1656b5a6fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5452197f58d5f1b8e377d0f79069fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9c7940d6f1ede201fd27d5d9e0650d.png)
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【推荐1】如图所示,在四边形ABCD中,∠DAB=90°,∠ADC=135°,AB=5,CD=2
,AD=2,求四边形ABCD绕AD旋转一周所成几何体的表面积及体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/4ad0d84a-faa8-4856-9945-42d288f2adc9.png?resizew=167)
您最近一年使用:0次
【推荐2】如图,几何体
为一个圆柱和圆锥的组合体,圆锥的底面和圆柱的一个底面重合,圆锥的顶点为P,圆柱的上、下底面的圆心分别为
、
,且该几何体有半径为2的外接球(即圆锥的顶点与底面圆周在球面上,且圆柱的底面圆周也在球面上),外接球球心为O.
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064377008128/STEM/76f933b9-1306-4e34-9a06-c8fc97fa3b7d.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064377008128/STEM/9b91774f-ba22-40ba-9950-56c127df6954.png?resizew=166)
(1)若圆柱的底面圆半径为
,求几何体
的表面积;
(2)若
,求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064377008128/STEM/76f933b9-1306-4e34-9a06-c8fc97fa3b7d.png?resizew=115)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064377008128/STEM/9b91774f-ba22-40ba-9950-56c127df6954.png?resizew=166)
(1)若圆柱的底面圆半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385f4234cc4bcddd32d5f41aad17257f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
您最近一年使用:0次