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領結的角度
Author:
周桂名
角度和不變
GeoGebra
New Resources
球體建築師
找出對稱軸
判斷球體
錐體建築師
【案例】圆柱体内放置一个大球六个小球
Discover Resources
proof AAS
銀杏葉
三個交點
三角形，邊上平分面積
Rotational symmetry examples
Discover Topics
Variance
Conditional Probability
Congruence
Straight Lines
Percentages