如图,圆锥的顶点为
,
是底面圆
的直径,
是圆
上异于
、
的一点,
是
的中点,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642464959455232/2645184514342912/STEM/8bff55557979453988775777dd608d76.png?resizew=212)
(1)求证:
;
(2)若
与
所成的角为60°,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006da0ad82b604b189445701ee8804b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ab7bd4b7520525ce61881a052c3f04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e043d2717a6cfd4b58e2dba958d361f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642464959455232/2645184514342912/STEM/8bff55557979453988775777dd608d76.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
更新时间:2021-01-27 15:44:34
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在正方体
中,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987820866666496/2989896347369472/STEM/21731d17-cb33-42f8-878f-1c24029a97d5.png?resizew=153)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eb89294b31ffdd2680b4361e8994d7.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987820866666496/2989896347369472/STEM/21731d17-cb33-42f8-878f-1c24029a97d5.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d783c4c83f932979e1b02886e3d0b3f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图所示的几何体中,底面ABCD为直角梯形,
,
,四边形PDCE为矩形,平面
平面ABCD,F为PA的中点,N为PC与DE的交点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/2424014c-8d14-426c-8a28-9caffd3b5f29.png?resizew=202)
(1)求证:
平面
;
(2)若G是线段CD上一点,平面PBC与平面EFG所成角的余弦值为
,求DG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6379891c7150af4188b5ab746d703bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7a201432af0a2f9d21c6803906f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/2424014c-8d14-426c-8a28-9caffd3b5f29.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53d5c96de34fcf95794e51c2761b671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若G是线段CD上一点,平面PBC与平面EFG所成角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1145c162038df3c7184d9201c628e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,平面图形
是一个直角梯形,其中
,
,
,
,
是
上一点,且
.将
沿着
折起使得平面
平面
,连接
、
,过点
作
,垂足为
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/18e755bc-d617-4b00-8f36-f77451802335.png?resizew=277)
(1)证明
;
(2)若
是
上一点,且
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2eff89502b7b1737ba9c8b77b47d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/a02c25b95e61557eec096de150ab873f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483f030abf61c6a0882d656d63cf4512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
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(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138c5f7d198ac502e5118346bc1122f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,在矩形ABCD中,AB=4,AD=2,E是CD的中点,现以AE为折痕将△DAE向上折起,D变为D',使得平面D'AE⊥平面ABCE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/28533602-22de-4159-9848-24e61e9589a7.png?resizew=336)
(1)求证:平面ABD'⊥平面BD'E;
(2)求直线CE与平面BCD'所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/28533602-22de-4159-9848-24e61e9589a7.png?resizew=336)
(1)求证:平面ABD'⊥平面BD'E;
(2)求直线CE与平面BCD'所成角的正弦值.
您最近一年使用:0次