正四面体abcd内接于半径为r的球o（即四个顶点在球面上），其内切球半径为r，（1）证明r＝3r （2）用r表百度知道 Sketch Coloring Page

正四面体abcd内接于半径为r的球o（即四个顶点在球面上），其内切球半径为r，（1）证明r＝3r （2）用r表百度知道 Template

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sketch #5279

anonymous

anonymous
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sketch #4646 Panda by Raimundo Santos

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anonymous
sketch #4646 Panda by Raimundo Santos

sketch #5340 Amazing Dragon

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sketch #3429 Another try of Miku xD

Chelley
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sketch #4661 Woodpecker by Hsien-Ying Hsieh

sketch #5250

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anonymous
sketch #5250

sketch #5085 CM Punk by Luciana Nazar

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sketch #970 Depression

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Laura Agapi Asnicar
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sketch #4778

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sketch #542 life

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sketch #1168

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sketch #3765 Happy easter!

anonymous

anonymous
sketch #3765 Happy easter!

sketch #4493 Jimi Hendrix by Alex Stoun

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anonymous
sketch #4493 Jimi Hendrix by Alex Stoun

sketch #664 Spider on a plant pot

Rachel Roe
sketch #664 Spider on a plant pot

sketch #4749 Random Girl by Adellachamp Stand

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anonymous
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anonymous
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anonymous
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sketch #2022

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sketch #5284

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anonymous
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sketch #5225 The Friendship by Annabelle Bourget

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anonymous
sketch #5225 The Friendship by Annabelle Bourget

sketch #3425 &#;Tonari no Kaibutsu-kun&#; by Betty Marie Melzer

anonymous

anonymous
sketch #3425 &#;Tonari no Kaibutsu-kun&#; by Betty Marie Melzer

sketch #1448 donara

Donara Smbatyan
sketch #1448 donara

sketch #3699 Dragon by Ana Cecilia

anonymous

anonymous
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sketch #4503 Naruto Biju Mode by Jessie Lightwood

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sketch #4503 Naruto Biju Mode by Jessie Lightwood

sketch #2753

Sofie Emilie Valentin Jeske
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tomski正四面体abcd内接于半径为r的球o（即四个顶点在球面上），其内切球半径为r，（1）证明r＝3r （2）用r表百度知道 coloring

正四面体ABCD内接于半径为R的球O（即四个顶点在球面上），其内切球半径为r，（1）证明R＝3r （2）用R表 百度知道 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

10．已知正四面体内接于半径为R的球用一平面去截此正四面体和球其截面如图则球心到截面的距离为 A． B． C． D．——青夏教育精英家教�—— sketch template

四面体外接球半径公式杂谈知乎 sketch template

内接于半圆的正方形面积与内接于这个圆的正方形的面积之比为A．12 B．23 C．25 D．34——青夏教育精英家教�—— sketch template

正四棱锥的顶点都在同一球面上若该棱锥的高为4底面边长为2则该球的表面积为A．B．C．D．题目和参考答案——青夏教育精英家教�—— sketch template

3 正四面体的外接球 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rO点与ABC sketch template

半径为整数的圆可以内接一个边长为1的正多边形吗？知乎 sketch template

内接于半圆的正方形面积与内接于这个圆的正方形的面积之比为A．12 B．23 C．25 D．34——青夏教育精英家教�—— sketch template

任意四面体的外接球半径公式知乎 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

圆锥的内切球 知乎 sketch template

已知四棱锥P ABCD的底面是边长为a的正方形所有侧棱长相等且等于a若其外接球的半径为R则aR等于．题目和参考答案——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

半径相等的圆的内接正三角形、正方形、正六边形的边长之比为？ 百度知道 sketch template

已知半径为3的球内有一个内接正方体即正方体的顶点都在球面上．1求此球的体积2求此球的内接正方体的体积3求此球的表面积与其内 sketch template

�已知正三角形的边长为a，其内切圆的半径为r，外接圆的半径为R，r：a：R= ；�已知正方形的边长为a 百度知道 sketch template

四面体外接球半径公式杂谈知乎 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

如图正三棱锥ABCD内接于球O底面边长为3侧棱长为2则球O的表面积为 A64π3B32π3C16π3D8π3 题目和参考 sketch template

勒洛四面体是一个非常神奇的“四面体”、它能在：两个平行平面间自由转动，并且始终保持与两平面都接触、因此它能像球一样来回滚动（如图甲），利用这一 sketch template

正三棱锥的高为1，底面边长为2√6，内有一个球与它的四个面都相切，求：三棱锥的表面积．内切球的半径． 百度教育 sketch template

初中数学，掌握好四点共圆的性质可以使复杂的题目变得简单易解知乎 sketch template

正四面体と球 教えて数学理� sketch template

如图四边形ABCD内接于⊙OAB是⊙O的直径AC和BD相交于点E且1求证BC=CD2分别延长ABDC交于点P过点A作 sketch template

正四棱锥的底面在球O的大圆面上顶点在球面上已知球的体积为则正四棱锥的体积的最大值为 ——青夏教育精英家教�—— sketch template

初中数学，掌握好四点共圆的性质可以使复杂的题目变得简单易解知乎 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

初中数学，掌握好四点共圆的性质可以使复杂的题目变得简单易解知乎 sketch template

四边形ABCD内接于圆其边AB与DC的延长线交于点PAD与BC的延长线交于点Q．由Q作该圆的两条切线QE和QF切点分别为EF．求证P sketch template

已知如图正八边形A1A2A3A4A5A6A7A8内接于半径为R的⊙O．1求A1A3的长2求四边形A1A2A3O的面积3求此 sketch template

在半径为R的圆中内接正方形与内接正六边形的边长之比为 ．题目和参考答案——青夏教育精英家教�—— sketch template

如图7正六边形内接于⊙⊙的半径为4则圆中阴影部分的面积为 ．——青夏教育精英家教�—— sketch template

如图，正六边形ABCDEF内接于圆O，圆O的半径为6，则这个正六边形的边心距OM和BC的长分别为（）A 3、π3B 323、πC 33 sketch template

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