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兩位數加法
找出對稱軸
画直线等分三角形的面积
球体的体积推导（优化版）
兩組對邊相等的四邊形
Discover Resources
三角形重心軌跡(動點在三圓上)
glt-h02-03-角錐角柱動態展開
圆锥曲线包络
congruent activity
S1 Ex9.2 Q17
Discover Topics
Sequences and Series
Vectors 3D (Three-Dimensional)
Congruence
Frequency Distribution
Triangles
