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立方體和平面的截面
Author:
hou yi ting
截出一個圓形吧
GeoGebra
. . . . . . . . 87截不出來
New Resources
異分母分數減法
拼砌四邊形
柱體建築師
兩組對邊相等的四邊形
球体的体积推导（优化版）
Discover Resources
題六
Billiard Ball
S1 Ex9.2 Q17
折線1
Template: 圓周
Discover Topics
Median Line
Sine
Functions
Cone
Prism