7．如图正四面体的棱长均为且平面于a点bcd均在平面外且在平面同一侧则点b到平面的距离是 A． B． C． D．——青夏教育精英 Sketch Coloring Page

7．如图正四面体的棱长均为且平面于a点bcd均在平面外且在平面同一侧则点b到平面的距离是 A． B． C． D．——青夏教育精英 Template

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tomski7．如图正四面体的棱长均为且平面于a点bcd均在平面外且在平面同一侧则点b到平面的距离是 a． b． coloring

如图，正四面体的长为1，， 则． sketch template

7．如图正四面体的棱长均为且平面于A点BCD均在平面外且在平面同一侧则点B到平面的距离是 A． B． C． D．——青夏教育精英 sketch template

深入浅出数学系列立体几何（3）：正四面体的性质知乎 sketch template

深入浅出数学系列立体几何（3）：正四面体的性质知乎 sketch template

深入浅出数学系列立体几何（3）：正四面体的性质知乎 sketch template

一个正四面体的各条棱长都是a那么这个正四面体的高百度经验 sketch template

正四面体ABCD棱长为2，E、F分别为BC、AD中点，则EF的长为 百度教育 sketch template

正四面体怎么建立空间直角坐标系�？知乎 sketch template

15．如图2正四面体ABCD的棱长为1H是顶点D的底面 ABC上的射影M在DH上且使得∠ABC=90°则DM的长 为 ——青夏教育 sketch template

由四个全等的等边三角形的封面几何体称为正四面体如图正四面体ABCD中EF分别是棱BCAD的中点CF与DE是一对异面直线在图形中 sketch template

已知菱形的边长为2，将沿折起，使得点至点的位置，得到四面体当二面角的大小为120°时，四面体的体积为；当四面体的体积为1时，以为球心，的长 sketch template

正四面体 中心到顶点距离为a，求四个顶点坐标百度知道 sketch template

如图四面体ABCD的每条棱长都等于2点EF分别为棱ABAD的中点则AB BC= BC EF= EF与AC所成的角为 sketch template

15．如图2正四面体ABCD的棱长为1H是顶点D的底面 ABC上的射影M在DH上且使得∠ABC=90°则DM的长 为 ——青夏教育 sketch template

如图已知正四面体A BCD的棱长为1EF分别为棱ABCD的中点 1建立适当的空间直角坐标系写出顶点ABCD的坐标 2 sketch template

已知正四面体ABCD的棱长为1求1该四面体的内切球的表面积2与该四面体各条棱均相切的球的体积3该四面体的外接球上AB两点间 sketch template

在棱长为a的正四面体中，相对两条棱间的距离为 百度教育 sketch template

如图已知正三棱柱ABC A1B1C1的各条棱长均为2M是BC的中点．Ⅰ求证A1C∥平面AB1MⅡ求证在棱CC1上找一点N使得 sketch template

如图正方体ABCD A1B1C1D1的棱长为1P为BC的中点Q为线段CC1上的动点过点APQ的平面截该正方体所得的截面记为S则 sketch template

4．如图是正方体或四面体PQRS分别是所在棱的中点这四个点不共面的一个图是 解析 在A图中分别连接PSQR 易证PS∥ sketch template

$如图已知正四面体D ABC所有棱长均相等的三棱锥PQR分别为ABBCCA上的点AP=PB$frac{BQ}{QC sketch template$

如图，已知正四面体的棱长为，，分别为棱，的中点．若高途 sketch template

如图是一个正四面体它的四个面都是正三角形现沿它的三条棱ACBCCD剪开展成平面图形则所得的展开图是 ——青夏教育精英家教�—— sketch template

2015年高考真题理�数学安徽卷百度题库 sketch template

如图，棱长为的正方体中，点，，分别是棱，，的中点，高途 sketch template

5．如图A BCD是一体积为的正四面体连结两个面的重心EF则线段EF的长是 ——青夏教育精英家教�—— sketch template

如图，已知正三棱柱ABC A 1B 1C 1的所有棱长都为2，D为CC 1中点，E为BC的中点（1）求证：BD⊥ 平面AB 1E；（2）求三 sketch template

7．如图在正三棱柱ABC A1B1C1中AB=3AA1=4M为AA1的中点P是BC上一点且由P沿棱柱侧面经过棱CC1到M点的最短 sketch template

如图已知正方体ABCD A1B1C1D1的棱长为1EF分别在棱ABBC上G在对角线BD1上且AE＝BF＝D1G∶GB＝1∶2 sketch template

如图正四棱锥S ABCD 的底面是边长为a正方形O为底面对角线交点侧棱长是底面边长的2倍P为侧棱SD上的点．Ⅰ求证AC⊥SD sketch template

如图所示在四棱锥S ABCD中底面ABCD是正方形侧棱SD⊥平面ABCDSD=DC点E是SC的中点作EF⊥SB交SB于点F．1 sketch template

如图正四棱锥S ABCD的所有棱长都相等过底面对角线 AC作平行于侧棱SB的截面交SD于E 1求AB与SC所成角的大小 2求 sketch template

如图已知正三棱柱 的底面边长为2侧棱长为点E在侧棱上点F在侧棱上且 I 求证 II 求直线与平面的夹角题目和参考 sketch template

如图正三棱柱ABC A1B1C1的九条棱均相等D是BC上一点AD⊥C1D 1求证截面ABC1⊥侧面BCC1B1 2求 sketch template

如图所示正四棱锥P ABCD的各棱长均为13MN分别为PABD上的点且PM∶MA=BN∶ND=5∶8 1求证直线MN∥平面 sketch template

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