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proof*5 張華炘
Author:
郭亮偉
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
錐體建築師
找出對稱軸
球体的体积推导（优化版）
Discover Resources
三角形數
parallel
定周长的正多边形面积变化规律
S0E03 平面截立方体
尺规作图
Discover Topics
Hypergeometric Distribution
Square
Parabola
Rhombus
Fractal Geometry