如图,在四棱锥
中,底面为直角梯形,
,
垂直于底面
,
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/1/6/2371472891535360/2371792347226112/STEM/09169b0c8ce549b78c8b10e324993116.png?resizew=198)
(1)求证:
四点共面,并证明
;
(2)求直线
与平面
所成角的大小.(用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b50a374d39f38a53c5d1c8ef84c43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf7488ccaf26541626131bceb8f1069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829a1a887ceba13dd8551b1e3604bf6f.png)
![](https://img.xkw.com/dksih/QBM/2020/1/6/2371472891535360/2371792347226112/STEM/09169b0c8ce549b78c8b10e324993116.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2c7f1c87799a8b1ba8ab9a68ef01ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ac67c3e6c36c184fc8a3a051654f471.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a422531ad292cf2bf33a2225f0bfb1.png)
更新时间:2020-01-07 09:26:47
|
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,已知三棱柱
,
为棱
上一点,
平面
.
![](https://img.xkw.com/dksih/QBM/2021/3/9/2674212377051136/2686303086477312/STEM/9f1c85f106884082b08ed17aa2d96648.png?resizew=189)
(1)求证:
;
(2)若
是等边三角形,
,
,
的面积为
,求三棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd597851c0db4e4de4769e10e09383b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a7494edc88340385272679347b6af2.png)
![](https://img.xkw.com/dksih/QBM/2021/3/9/2674212377051136/2686303086477312/STEM/9f1c85f106884082b08ed17aa2d96648.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5f0e2cc2158bd508edd68e05a892b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26208e5d58cc5abf1af936480d1932b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d687131f89af18576986211e65216a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
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解答题-证明题
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解题方法
【推荐2】如图,在四棱锥
中,平面
平面
,且
,四边形
满足
,
为侧棱
上的任意一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/c3f70816-5499-4bc9-be2e-d1b63a99c4b8.png?resizew=204)
(1)求证:平面
平面
.
(2)是否存在点
,使得直线
与平面
垂直?若存在,写出证明过程并求出线段
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071b306602ab87164c434c1fa3d575a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6993230fcbbc79d49be275c51642be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/c3f70816-5499-4bc9-be2e-d1b63a99c4b8.png?resizew=204)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1af463c1192cc6472c70ca84d9bdeb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
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【推荐3】在直四棱柱ABCD-A1B1C1D1中,四边形ABCD为平行四边形,M为AA1的中点,BC=BD=1,
.
(1)求证:MD⊥平面BDC1;
(2)求二面角M-BC1-D的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a74b4952ac58a5e3fa3f2de86024ef6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/6db34a24-5808-4d7c-b4f0-b5425e206fe2.jpg?resizew=166)
(1)求证:MD⊥平面BDC1;
(2)求二面角M-BC1-D的余弦值.
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【推荐1】如图,在四棱锥
中,底面ABCD是矩形,
平面ABCD,
,
,点Q是PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/8bf24a5a-7490-446b-9f02-c9e94cc4de56.png?resizew=207)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6187fbd82d1ad9c738f0e6d26efd19.png)
(2)在线段AB上是否存在点F,使直线PF与平面PAD所成的角为
?若存在,求出AF的长,若不存在,请说明理由?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5a9a04de2ddcec2b2799ab5476f2c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c65eb5f697217370d3c47f26c68113.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/8bf24a5a-7490-446b-9f02-c9e94cc4de56.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6187fbd82d1ad9c738f0e6d26efd19.png)
(2)在线段AB上是否存在点F,使直线PF与平面PAD所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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【推荐2】如图,四棱锥P﹣ABCD的底面ABCD是正方形,侧棱PA⊥底面ABCD,PA=AD,E、F分别是棱PD、BC的中点.
(1)求证:AE⊥PC;
(2)求直线PF与平面PAC所成的角的正切值.
(1)求证:AE⊥PC;
(2)求直线PF与平面PAC所成的角的正切值.
![](https://img.xkw.com/dksih/QBM/2011/9/15/1570312826298368/1570312831598592/STEM/ec67dd9cc7814d3eb5a316a6476199db.png?resizew=193)
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【推荐3】如图,三棱台
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/dda4d92e-8f1f-41e2-bf3e-cea9ea809d99.png?resizew=183)
(1)求证:
;
(2)若二面角
的平面角为60°,求直线AC1与平面BCC1B,所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97594af1259a4ca6fdc39391c320ae14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/dda4d92e-8f1f-41e2-bf3e-cea9ea809d99.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa847b323caebbd284f2a34be0235b5.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0b3d1e480935dac4968265f68ac702.png)
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