正多面体被古希腊圣哲认为是构成宇宙的基本元素,加上它们的多种变体,一直是科学、艺术、哲学灵感的源泉之一.如图,该几何体是一个高为4的正八面体,G为
的中点,则异面直线
与
所成角的正弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
更新时间:2024-05-25 16:44:30
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【知识点】 异面直线夹角的向量求法
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【推荐1】我们通常把圆、椭圆、抛物线、双曲线统称为圆锥曲线,通过普通高中课程实验教科书《数学》2-1第二章《圆锥曲线与方程》章头引言我们知道,用一个垂直于圆锥的轴的平面截圆锥,截口曲线(截面与圆锥侧面的交线)是一个圆,实际上,设圆锥母线与轴所成角为
,不过圆锥顶点的截面与轴所成角为
.当
,截口曲线为圆,当
时,截口曲线为椭圆;当
时,截口曲线为双曲线;当
时,截口曲线为抛物线;如图2,正方体
中,
为
边的中点,点
在平面
上运动并且使
,那么点
的轨迹是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】已知在三棱锥
中,
,
,
,则异面直线
与
所成角的余弦值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfc9df9c661bd93b3f4f51f91534c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77f3806d233b8adfee8790a42f3ce5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
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