例4、正四面体的棱长为a，则其内切球和外接球的半径是多�体积是多�？练习： 角度一直三棱柱的外接球1．2013辽宁高考已知直三棱柱 Sketch Coloring Page

例4、正四面体的棱长为a，则其内切球和外接球的半径是多�体积是多�？练习： 角度一直三棱柱的外接球1．2013辽宁高考已知直三棱柱 Template

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tomski例4、正四面体的棱长为a，则其内切球和外接球的半径是多�体积是多�？练习： 角度一 coloring

深入浅出数学系列立体几何（4）：球的切接问题（上）知乎 sketch template

2．求棱长为a的正四面体外接球的半径．百度教育 sketch template

高中数学：几何体表面积与体积的教学设计知乎 sketch template

求棱长为a的正四面体的内切球、棱切球的半径 百度教育 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

求棱长为a的正四面体的外接球与内切球的半径．题目和参考答案——青夏教育精英家教�—— sketch template

如图，正四面体的长为1，， 则． 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

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

求棱长为a的正四面体的外接球和内切球的半径 解析如图作AH⊥底面BCD于H则AH＝a设内切球的球心为O半径为rO点与ABC sketch template

正四面体棱切球图示千图� 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

分子点群的归属（2）对称性高的点群化学空间 Chem Station sketch template

16．过正四面体外接球球心的平面截正四面体所得截面如图所示——青夏教育精英家教�—— sketch template

正四面体一个顶点处的立体角是多大？知乎 sketch template

求棱长为a的正四面体的外接球和内切球的半径 解析如图作AH⊥底面BCD于H则AH＝a设内切球的球心为O半径为rO点与ABC 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

例4、正四面体的棱长为a，则其内切球和外接球的半径是多�体积是多�？ 练习： 角度一 直三棱柱的外接球1．2013辽宁高考已知直三棱柱 sketch template

任意四面体的外接球半径公式知乎 sketch template

五种正多面体的二面角以及体积的计算，以及六种四维正多胞体的二胞角和超体积的计算。知乎 sketch template

球体与正四面体切接知乎 sketch template

正四面体ABCD的棱长为1G是底面 ABC的中心M在线段DG上且使∠AMB=90°则GM的长等于 A B C D——青夏 sketch template

3 正四面体的外接球 sketch template

棱长为2的正四面体的四个顶点都在同一个球面上若过该球球心的一个截面如图1则图中三角形的面积是 A． B． C． D．题目和参考答案——青 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

深入浅出数学系列立体几何（4）：球的切接问题（上）知乎 sketch template

$已知四面体P ABC的外接球的球心O在AB上且PO⊥平面ABC2AC=$sqrt{3}$AB若四面体P ABC 的体积为$frac sketch template$

已知正四面体的棱长为a．1求正四面体的高2求正四面体内切球的半径和体积．题目和参考答案——青夏教育精英家教�—— sketch template

深入浅出数学系列立体几何（4）：球的切接问题（上）知乎 sketch template

棱长为2的正四面体的四个顶点都在同一个球面上若过该球球心的一个截面如图则图中三角形的面积是 ．题目和参考答案——青夏教育精英家教�—— sketch template

设四面体的各条棱长都为1若该四面体的各个顶点都在同一个球面上求该球的表面积．题目和参考答案——青夏教育精英家教�—— sketch template

在正四面体的6条棱中随机抽取2条那么其2条棱互相垂直的概率为〔〕 A B C D 百度教育 sketch template

已知球是正四面体的外接球，为棱的中点，是棱上的一点高途 sketch template

5．正四面体PABC中M为棱AB的中点则PA与CM所成角的余弦值为 A B C D 解析如图取PB中点N ——青夏 sketch template

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