如图,点
是以
为直径的圆周上的一点,
,
,
平面
,点
为
中点.
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace900749d0861aa51fcc6d72c51f82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
更新时间:2017-05-03 19:16:41
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,已知四棱锥中,
平面
,
,
,
,
为
中点.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.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1,在
中,
,
,
,且
分别为BC,AD的中点,延长CE交AB于点F.现将△ACD沿AD翻折至△AC'D,使得
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8b25cad7-4f05-4702-a9c6-93257f85a5df.png?resizew=493)
(1)求证:
;
(2)点G为线段C'D的中点,求直线FG与平面BEC'所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c7f0d0987ee427b7efbbf889b9bf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794cd813dabab72619eb276f93c1769e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8b25cad7-4f05-4702-a9c6-93257f85a5df.png?resizew=493)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed96a8bd80187c8ed5fdf272832ca8a4.png)
(2)点G为线段C'D的中点,求直线FG与平面BEC'所成角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,四棱锥
中,
平面ABCD,
,底面ABCD是矩形,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/fb331a2a-ebd3-4ed1-9e09-edc2eb3db141.png?resizew=151)
(1)求证:
平面PCD;
(2)求直线AC与平面APD所成的角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5064f5ce5ac8428e277fd578da84ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/fb331a2a-ebd3-4ed1-9e09-edc2eb3db141.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
(2)求直线AC与平面APD所成的角的正弦值;
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,四边形
是梯形,
且
,
是边长为2的正三角形,顶点
在
上射影为点
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2017/5/23/1693230970683392/1694089200041984/STEM/293e4c68b7894405a1f926787e16ed75.png?resizew=144)
(1)证明:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e409a3a0db612b3fbe8f26bc40e83e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03952d664fba91020fc5f3bcf2f9746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bd9e8b54864ca44115d24a5aeeb83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc6b661d6eac048285e4faf67e07ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6c3ec6ee03bb1119c5e619d1dd81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb1159f900bc18bb46b87f966c1e9bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a0f55bd08d2837ea23bc06b0989419.png)
![](https://img.xkw.com/dksih/QBM/2017/5/23/1693230970683392/1694089200041984/STEM/293e4c68b7894405a1f926787e16ed75.png?resizew=144)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cc987fab8fc64dffda0cd31804c9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bea858b0f0027b675cbe1193cff9210.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,在直三棱柱
中,
,
,
分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/0a2f550d-388d-404c-96a7-3b99c9b2cf82.png?resizew=164)
(1)求证:
平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ba846c4dec057a9eec4174306efd06.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4df5845bc756fe9d1a8af6bb56fcc36.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/0a2f550d-388d-404c-96a7-3b99c9b2cf82.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7caa95b00cb6c2d12b1b9eb666cc848d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec2a049ae4316eacff4b303b251e770.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6dd051db98c531f9ef18cdfd793f4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
您最近一年使用:0次