如图,AB是圆O的直径,点C是圆O上异于A,B的点,P为平面ABC外一点,E,F分别是PA,PC的中点.记平面BEF与平面ABC的交线为l,试判断直线l与平面PAC的位置关系,并加以证明.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974315087159296/2983263381938176/STEM/5ef2f618-8261-4f5a-bcf5-d0cd3a57cea7.png?resizew=121)
21-22高一·全国·课前预习 查看更多[1]
(已下线)8.5.2直线与平面平行(导学案)原卷版-2021-2022学年高一数学同步备课 (人教A版2019 必修第二册)
更新时间:2022-05-20 07:27:47
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【推荐1】如图,平面
,
,
两两相交,a,b,c为3条交线,且
.求证:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff4e42856fa5f6a4e12993e53b065e3.png)
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【推荐2】如图是某直三棱柱被削去上底后的直观图与三视图的侧视图、俯视图,在直观图中,M是BD的中点,
,侧视图是直角梯形,俯视图是等腰直角三角形,有关数据如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/615d4960-9f6e-484f-97bb-e2a639af2bfa.png?resizew=317)
(Ⅰ)求证:EM∥平面ABC;
(Ⅱ)求出该几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f35527ec68609d06c63c7be4ed036f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/615d4960-9f6e-484f-97bb-e2a639af2bfa.png?resizew=317)
(Ⅰ)求证:EM∥平面ABC;
(Ⅱ)求出该几何体的体积.
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【推荐1】在正方体
中,E、F分别是棱AB、CD的中点.
(1)求证:
面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/289e7d9c-2de6-436d-85f7-e4b322fcfe59.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185729402f3b20ac3e0b003be9b385eb.png)
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【推荐2】如图,在正四棱锥
中,
,点M,N分别在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/461c6c0a-e983-4703-8229-c40958911ea7.png?resizew=211)
(1)求证:
平面
;
(2)当
时,求平面
与平面
所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e87d4d9a3b0f961483bf4f68be9c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3c2833cccccee8830d29af0977338dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/461c6c0a-e983-4703-8229-c40958911ea7.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbc74aa0d6c8ff230e586227f2eed9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐1】已知:如图,
,
,
,且
.求证:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b707f5ee4fbb2e637c65fbc6d8ed03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d2a947e3fdc214d40a7d3f54679a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5475e10ea3f37788e680395999037a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db444986aaa51a15bb84c12a73238b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3728b5463f1fe868979213bf32ff2a5c.png)
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【推荐2】如图,直线l平行于平面
,
是过直线l的平面,平面
与
相交于直线m.求证:直线l平行于直线m.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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