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把手(環面)
Author:
Yu-Tuan Lin
GeoGebra
New Resources
多邊形的面積
第八周作业
三位數除以一位數（二）
平行線的斜率
空间中两直线的位置关系
Discover Resources
Angle at Centre Twice Angle at Circumference
Perimeter
空間線性組合
製作對稱圖形 level 2
三圓外切
Discover Topics
Rational Numbers
Triangles
Ratios
Arithmetic
Cone