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围棋（可摆盘、双人对战，不可人机对战）
Author:
阳光
Topic:
Constructions
GeoGebra
New Resources
拼砌四邊形
柱體建築師
找出對稱軸
畫出對稱圖形
兩組對邊相等和有直角的四邊形
Discover Resources
初犯九點圓
選擇合適的「中間人」
gltcf 長方體
拋物線2-焦點法
F4_Ch9.1 任意角的三角比
Discover Topics
Surface
Similarity Transformation or Similarity
Orthocenter
Rational Numbers
Tree Diagrams