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ie 9
Author:
LAM YU SANG
GeoGebra
New Resources
直角坐標平面上的旋轉變換
画直线等分三角形的面积
球體建築師
三位數除以一位數（一）
第八周作业
Discover Resources
Time
Normal Vector
分點公式：P = (?)A + (?)B + (?)C
三角碎形
圈圈移動
Discover Topics
Line Segment
Curve Sketching
Complex Numbers
Congruence
Centroid or Barycenter