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勒洛四面体（参数曲面法）
Author:
孟宝兴
GeoGebra
New Resources
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
球体的体积推导
【案例】圆柱体内放置一个大球六个小球
Discover Resources
鉛筆的長度
堆疊(圓、正方形、正三角形)
ma_test
用圓作成的三角形
矩形性质推论
Discover Topics
Ratios
Integers
Rational Numbers
Parabola
Incircle or Inscribed Circle