如图,已知菱形
中,
,
,
为边
的中点,将
沿
翻折成
(点
位于平面
上方),连接
和
,
为
的中点,则在翻折过程中,点
的轨迹的长度为______ .
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23-24高二上·四川内江·期中 查看更多[3]
四川省内江市第一中学2023-2024学年高二上学期期中数学试题四川省遂宁市射洪中学校2023-2024学年高二上学期第三次学月考试数学试题(已下线)第三章 空间轨迹问题 专题五 微点2 翻折、旋转问题中的轨迹问题综合训练【培优版】
更新时间:2023-11-26 08:20:37
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解题方法
【推荐1】在四棱锥
中,底面
为正方形,平面
都与平面
垂直,
,点
分别为
的中点,且
是线段
上一点(包含端点),给出下列结论:①四边形
为等腰梯形;②不存在点
,使得
平面
;③存在点
,使得
;④
的最小值为
.其中所有正确结论的序号为______ .
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【推荐2】如图,正方体
的棱长为2,E,F分别为
,
的中点,P是底面
上一点.若
平面BEF,则AP与平面
成角的正弦值的取值范围是___________ .
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【推荐1】如图,在棱长为8的正方体
中,
是棱
上的一个动点,给出下列三个结论:①若
为
上的动点,则
的最小值为
;②
到平面
的距离的最大值为
;③
为
的中点,
为空间中一点,且
与平面
所成的角为
,
与平面
所成的角为
,则
在平面
上射影的轨迹长度为
,其中所有正确结论的序号是________ .
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【推荐2】如图,正方形
和矩形
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在正方形
及其内部运动,点
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体积最大时,则该四面体的内切球半径为___________ .
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